Property:Special status

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Abelmoschus +
Introduced  +
Abelmoschus esculentus +
Illustrated  +, Introduced  +, Weedy  +
Abies amabilis +
Endemic  +
Abies balsamea +
Illustrated  +, Endemic  +
Abies bifolia +
Endemic  +
Abies bracteata +
Endemic  +, Conservation concern  +
Abies concolor +
Illustrated  +
Abies fraseri +
Endemic  +, Conservation concern  +
Abies grandis +
Illustrated  +, Endemic  +
Abies lasiocarpa +
Endemic  +
Abies lowiana +
Endemic  +
Abies magnifica +
Endemic  +
Abies procera +
Endemic  +
Abietinella abietina +
Illustrated  +
Abildgaardia ovata +
Illustrated  +
Abronia alpina +
Endemic  +, Conservation concern  +
Abronia ameliae +
Endemic  +
Abronia ammophila +
Endemic  +, Conservation concern  +
Abronia angustifolia +
Illustrated  +
Abronia argillosa +
Endemic  +
Abronia bigelovii +
Illustrated  +, Endemic  +, Conservation concern  +
Abronia carletonii +
Endemic  +
Abronia elliptica +
Illustrated  +, Endemic  +
Abronia fragrans +
Illustrated  +
Abronia latifolia +
Endemic  +
Abronia macrocarpa +
Illustrated  +, Endemic  +, Conservation concern  +
Abronia mellifera +
Endemic  +
Abronia nana +
Endemic  +
Abronia nana var. covillei +
Endemic  +
Abronia nana var. nana +
Endemic  +
Abronia pogonantha +
Illustrated  +, Endemic  +
Abronia turbinata +
Illustrated  +, Endemic  +
Abronia umbellata var. acutalata +
Endemic  +
Abronia umbellata var. breviflora +
Endemic  +
Abronia villosa +
Illustrated  +
Abronia villosa var. aurita +
Illustrated  +, Conservation concern  +
Abronia villosa var. villosa +
Illustrated  +
Abutilon hirtum +
Introduced  +
Abutilon hypoleucum +
Illustrated  +
Abutilon mollicomum +
Illustrated  +
Abutilon palmeri +
Illustrated  +
Abutilon parishii +
Conservation concern  +
Abutilon theophrasti +
Introduced  +, Weedy  +
Acaena novae-zelandiae +
Illustrated  +, Introduced  +, Weedy  +
Acaena pallida +
Introduced  +
Acaena pinnatifida +
Illustrated  +
Acalypha alopecuroidea +
Introduced  +
Acalypha arvensis +
Introduced  +
Acalypha australis +
Introduced  +
Acalypha californica +
Illustrated  +
Acalypha deamii +
Endemic  +
Acalypha gracilens +
Weedy  +, Illustrated  +, Endemic  +
Acalypha monococca +
Endemic  +
Acalypha neomexicana +
Weedy  +
Acalypha ostryifolia +
Weedy  +, Illustrated  +
Acalypha rhomboidea +
Weedy  +, Illustrated  +, Endemic  +
Acalypha setosa +
Introduced  +
Acalypha virginica +
Weedy  +, Illustrated  +, Endemic  +
Acalypha wilkesiana +
Introduced  +
Acamptopappus shockleyi +
Endemic  +
Acamptopappus sphaerocephalus +
Illustrated  +, Endemic  +
Acamptopappus sphaerocephalus var. hirtellus +
Endemic  +
Acamptopappus sphaerocephalus var. sphaerocephalus +
Illustrated  +, Endemic  +
Acanthocereus tetragonus +
Illustrated  +
Acanthoscyphus parishii +
Illustrated  +, Endemic  +
Acanthoscyphus parishii var. abramsii +
Endemic  +
Acanthoscyphus parishii var. cienegensis +
Endemic  +
Acanthoscyphus parishii var. goodmaniana +
Endemic  +
Acanthoscyphus parishii var. parishii +
Illustrated  +, Endemic  +
Acanthospermum australe +
Introduced  +, Illustrated  +
Acanthospermum hispidum +
Introduced  +
Acanthospermum humile +
Introduced  +
Achillea millefolium +
Illustrated  +
Achillea ptarmica +
Introduced  +
Achlys californica +
Endemic  +
Achlys triphylla +
Endemic  +, Illustrated  +
Achnatherum aridum +
Endemic  +
Achnatherum latiglume +
Endemic  +
Achnatherum lemmonii +
Endemic  +
Achnatherum lemmonii subsp. lemmonii +
Endemic  +
Achnatherum lemmonii subsp. pubescens +
Endemic  +
Achnatherum lettermanii +
Endemic  +
Achnatherum nelsonii subsp. dorei +
Endemic  +
Achnatherum nevadense +
Endemic  +
Achnatherum occidentale +
Endemic  +
Achnatherum occidentale subsp. californicum +
Endemic  +
Achnatherum occidentale subsp. occidentale +
Endemic  +
Achnatherum occidentale subsp. pubescens +
Endemic  +
Achnatherum pinetorum +
Endemic  +
Achnatherum stillmanii +
Endemic  +
Achnatherum thurberianum +
Endemic  +
Achnatherum webberi +
Endemic  +
Achyrachaena mollis +
Illustrated  +
Achyranthes aspera +
Illustrated  +
Achyranthes aspera var. aspera +
Introduced  +, Illustrated  +
Achyranthes aspera var. pubescens +
Illustrated  +
Achyranthes japonica +
Introduced  +
Achyronychia cooperi +
Illustrated  +
Acleisanthes acutifolia +
Illustrated  +
Acleisanthes chenopodioides +
Illustrated  +
Acleisanthes crassifolia +
Conservation concern  +
Acleisanthes diffusa +
Illustrated  +, Endemic  +
Acleisanthes lanceolata +
Illustrated  +
Acleisanthes lanceolata var. lanceolata +
Illustrated  +
Acleisanthes longiflora +
Illustrated  +
Acleisanthes nevadensis +
Endemic  +
Acleisanthes wrightii +
Conservation concern  +
Acmella pusilla +
Introduced  +
Acmella repens +
Illustrated  +
Acoelorraphe wrightii +
Illustrated  +, Conservation concern  +
Aconitum columbianum +
W2  +, Illustrated  +
Aconitum columbianum subsp. columbianum +
Illustrated  +
Aconitum columbianum subsp. viviparum +
Endemic  +, Illustrated  +
Aconitum delphiniifolium +
Illustrated  +
Aconitum maximum +
Illustrated  +
Aconitum maximum subsp. maximum +
Illustrated  +
Aconitum reclinatum +
Endemic  +, Illustrated  +
Aconitum uncinatum +
Endemic  +, Illustrated  +
Aconogonon alaskanum +
Illustrated  +
Aconogonon alaskanum var. alaskanum +
Illustrated  +
Aconogonon alaskanum var. glabrescens +
Illustrated  +, Endemic  +
Aconogonon davisiae +
Endemic  +
Aconogonon davisiae var. davisiae +
Endemic  +
Aconogonon davisiae var. glabrum +
Endemic  +
Aconogonon phytolaccifolium +
Endemic  +
Aconogonon phytolaccifolium var. glabrum +
Endemic  +
Aconogonon phytolaccifolium var. phytolaccifolium +
Endemic  +
Acorus americanus +
Illustrated  +, Endemic  +
Acorus calamus +
Introduced  +, Illustrated  +
Acourtia runcinata +
Illustrated  +
Acrocomia totai +
Introduced  +, Illustrated  +
Acroporium smallii +
Endemic  +, Illustrated  +
Acroptilon repens +
Introduced  +, Illustrated  +
Acrostichum danaeifolium +
Illustrated  +
Actaea pachypoda +
Endemic  +, Illustrated  +
Actaea rubra +
W2  +, Endemic  +, Illustrated  +
Actinostachys pennula +
Illustrated  +
Adelia vaseyi +
Illustrated  +
Adenocaulon bicolor +
Illustrated  +, Endemic  +
Adenophyllum cooperi +
Illustrated  +, Endemic  +
Adenostoma fasciculatum +
Illustrated  +
Adenostoma fasciculatum var. fasciculatum +
Illustrated  +
Adenostoma fasciculatum var. obtusifolium +
Illustrated  +
Adenostoma fasciculatum var. prostratum +
Endemic  +
Adiantum aleuticum +
Illustrated  +
Adiantum capillus-veneris +
Illustrated  +
Adiantum jordanii +
Illustrated  +
Adiantum pedatum +
Illustrated  +
Adiantum tenerum +
Illustrated  +
Adiantum viridimontanum +
Endemic  +
Adlumia fungosa +
Endemic  +, Illustrated  +
Adolphia infesta +
Illustrated  +
Adonis aestivalis +
Illustrated  +, Introduced  +
Adonis annua +
W1  +, Illustrated  +, Introduced  +
Adonis vernalis +
W1  +, Introduced  +
Aegilops crassa +
Introduced  +
Aegilops cylindrica +
Introduced  +
Aegilops triuncialis +
Introduced  +
Aeonium arboreum +
Introduced  +
Aeonium arboreum var. arboreum +
Introduced  +
Aeonium haworthii +
Introduced  +, Illustrated  +
Agalinis aphylla +
Illustrated  +, Endemic  +
Agalinis aspera +
Endemic  +
Agalinis auriculata +
Endemic  +, Conservation concern  +
Agalinis caddoensis +
Endemic  +, Conservation concern  +
Agalinis calycina +
Conservation concern  +
Agalinis decemloba +
Endemic  +, Conservation concern  +
Agalinis densiflora +
Endemic  +
Agalinis divaricata +
Illustrated  +, Endemic  +
Agalinis edwardsiana +
Endemic  +
Agalinis filicaulis +
Illustrated  +, Endemic  +
Agalinis filifolia +
Endemic  +
Agalinis flexicaulis +
Endemic  +, Conservation concern  +
Agalinis gattingeri +
Endemic  +
Agalinis georgiana +
Illustrated  +, Endemic  +, Conservation concern  +
Agalinis heterophylla +
Endemic  +
Agalinis homalantha +
Endemic  +
Agalinis laxa +
Illustrated  +, Endemic  +
Agalinis linifolia +
Endemic  +
Agalinis maritima var. maritima +
Endemic  +
Agalinis navasotensis +
Illustrated  +, Endemic  +, Conservation concern  +
Agalinis neoscotica +
Endemic  +
Agalinis obtusifolia +
Illustrated  +, Endemic  +
Agalinis oligophylla +
Illustrated  +, Endemic  +
Agalinis plukenetii +
Endemic  +
Agalinis pulchella +
Illustrated  +, Endemic  +
Agalinis purpurea +
Endemic  +
Agalinis purpurea var. parviflora +
Endemic  +
Agalinis purpurea var. purpurea +
Endemic  +
Agalinis setacea +
Illustrated  +, Endemic  +
Agalinis skinneriana +
Endemic  +
Agalinis tenella +
Illustrated  +, Endemic  +
Agalinis tenuifolia +
Endemic  +
Agalinis viridis +
Endemic  +
Agarista populifolia +
Illustrated  +, Endemic  +
Agave chrysantha +
Endemic  +
Agave decipiens +
Endemic  +
Agave deserti +
Illustrated  +
Agave deserti var. deserti +
Illustrated  +
Agave deserti var. simplex +
Illustrated  +
Agave desmettiana +
Introduced  +
Agave neglecta +
Endemic  +, Conservation concern  +
Agave parryi +
Illustrated  +
Agave parryi subsp. neomexicana +
Endemic  +
Agave parryi subsp. parryi +
Illustrated  +
Agave parryi var. couesii +
Endemic  +
Agave parryi var. huachucensis +
Illustrated  +
Agave parryi var. parryi +
Illustrated  +
Agave schottii var. treleasei +
Endemic  +
Agave shawii +
Illustrated  +
Agave shawii var. shawii +
Illustrated  +
Agave sisalana +
Introduced  +
Agave toumeyana +
Illustrated  +, Endemic  +
Agave toumeyana var. bella +
Illustrated  +, Endemic  +
Agave toumeyana var. toumeyana +
Illustrated  +, Endemic  +
Agave utahensis +
Illustrated  +, Endemic  +
Agave utahensis subsp. kaibabensis +
Endemic  +
Agave utahensis subsp. utahensis +
Illustrated  +, Endemic  +
Agave utahensis var. eborispina +
Endemic  +
Agave utahensis var. nevadensis +
Illustrated  +, Endemic  +
Agave utahensis var. utahensis +
Endemic  +
Agave weberi +
Introduced  +
Agdestis clematidea +
Illustrated  +
Ageratina adenophora +
Introduced  +
Ageratina altissima +
Illustrated  +, Endemic  +
Ageratina altissima var. altissima +
Illustrated  +, Endemic  +
Ageratina altissima var. roanensis +
Endemic  +
Ageratina aromatica +
Endemic  +
Ageratina jucunda +
Endemic  +
Ageratina luciae-brauniae +
Endemic  +
Ageratina occidentalis +
Illustrated  +, Endemic  +
Ageratina shastensis +
Endemic  +
Ageratum conyzoides +
Introduced  +
Ageratum corymbosum +
Illustrated  +
Ageratum houstonianum +
Introduced  +
Agnorhiza bolanderi +
Illustrated  +, Endemic  +
Agnorhiza elata +
Endemic  +
Agnorhiza invenusta +
Endemic  +
Agnorhiza reticulata +
Endemic  +, Conservation concern  +
Agoseris apargioides +
Endemic  +
Agoseris apargioides var. apargioides +
Endemic  +
Agoseris apargioides var. eastwoodiae +
Endemic  +
Agoseris apargioides var. maritima +
Endemic  +
Agoseris aurantiaca +
Illustrated  +, Endemic  +
Agoseris aurantiaca var. aurantiaca +
Illustrated  +, Endemic  +
Agoseris aurantiaca var. purpurea +
Illustrated  +, Endemic  +
Agoseris glauca +
Illustrated  +, Endemic  +
Agoseris glauca var. dasycephala +
Illustrated  +, Endemic  +
Agoseris glauca var. glauca +
Illustrated  +, Endemic  +
Agoseris grandiflora +
Endemic  +
Agoseris grandiflora var. grandiflora +
Endemic  +
Agoseris grandiflora var. leptophylla +
Endemic  +
Agoseris heterophylla var. cryptopleura +
Endemic  +
Agoseris hirsuta +
Endemic  +
Agoseris parviflora +
Endemic  +
Agrimonia gryposepala +
Illustrated  +
Agrimonia incisa +
Endemic  +, Illustrated  +
Agrimonia microcarpa +
Conservation concern  +, Endemic  +, Illustrated  +
Agrimonia parviflora +
Illustrated  +
Agrimonia pubescens +
Endemic  +, Illustrated  +
Agrimonia rostellata +
Endemic  +, Illustrated  +
Agrimonia striata +
Illustrated  +
Agropyron cristatum +
Introduced  +
Agrostemma githago +
Weedy  +, Introduced  +, Illustrated  +
Agrostemma githago var. githago +
Weedy  +, Introduced  +, Illustrated  +
Agrostis blasdalei +
Endemic  +
Agrostis canina +
Introduced  +
Agrostis capillaris +
Introduced  +
Agrostis densiflora +
Endemic  +
Agrostis gigantea +
Introduced  +
Agrostis hallii +
Endemic  +
Agrostis hendersonii +
Endemic  +
Agrostis hooveri +
Endemic  +
Agrostis howellii +
Endemic  +
Agrostis oregonensis +
Endemic  +
Agrostis rossiae +
Endemic  +
Agrostis variabilis +
Endemic  +
Aira caryophyllea +
Introduced  +
Aira caryophyllea var. capillaris +
Introduced  +
Aira caryophyllea var. caryophyllea +
Introduced  +
Aira caryophyllea var. cupaniana +
Introduced  +
Aira praecox +
Introduced  +
Akebia quinata +
Illustrated  +, Introduced  +
Alcea +
Introduced  +
Alcea rosea +
Illustrated  +, Introduced  +, Weedy  +
Alcea rugosa +
Introduced  +
Alchemilla filicaulis +
Illustrated  +
Alchemilla filicaulis subsp. filicaulis +
Illustrated  +
Alchemilla filicaulis subsp. vestita +
Illustrated  +
Alchemilla glabra +
Introduced  +
Alchemilla glaucescens +
Introduced  +
Alchemilla micans +
Introduced  +
Alchemilla mollis +
Introduced  +
Alchemilla monticola +
Introduced  +
Alchemilla subcrenata +
Introduced  +
Alchemilla venosa +
Introduced  +
Alchemilla xanthochlora +
Introduced  +
Aletris aurea +
Endemic  +
Aletris bracteata +
Conservation concern  +
Aletris farinosa +
Illustrated  +, Endemic  +
Aletris lutea +
Endemic  +
Aletris obovata +
Endemic  +
Alisma lanceolatum +
Introduced  +
Alisma plantago-aquatica +
Introduced  +
Alisma subcordatum +
Illustrated  +
Alisma triviale +
Illustrated  +
Allenrolfea occidentalis +
Illustrated  +
Alliaria petiolata +
Weedy  +, Introduced  +, Illustrated  +
Allionia choisyi +
Illustrated  +
Allionia incarnata +
Illustrated  +
Allionia incarnata var. incarnata +
Illustrated  +
Allionia incarnata var. villosa +
Illustrated  +
Allium aaseae +
Illustrated  +, Endemic  +
Allium abramsii +
Endemic  +
Allium acuminatum +
Illustrated  +, Endemic  +
Allium ampeloprasum +
Introduced  +
Allium amplectens +
W2  +, Endemic  +
Allium anceps +
Endemic  +
Allium atrorubens +
Endemic  +
Allium atrorubens var. atrorubens +
Endemic  +
Allium atrorubens var. cristatum +
Endemic  +
Allium bigelovii +
Endemic  +
Allium bisceptrum +
Endemic  +
Allium bolanderi +
Endemic  +
Allium bolanderi var. bolanderi +
Endemic  +
Allium bolanderi var. mirabile +
Endemic  +
Allium brandegeei +
Illustrated  +, Endemic  +
Allium brevistylum +
Illustrated  +, Endemic  +
Allium burlewii +
Illustrated  +, Endemic  +
Allium campanulatum +
Endemic  +
Allium canadense +
W2  +, W1  +, Illustrated  +, …
Allium canadense var. canadense +
Illustrated  +, Endemic  +
Allium canadense var. ecristatum +
Endemic  +
Allium canadense var. fraseri +
Endemic  +
Allium canadense var. hyacinthoides +
Endemic  +
Allium canadense var. lavendulare +
W2  +, W1  +, Illustrated  +, …
Allium canadense var. mobilense +
Illustrated  +, Endemic  +
Allium cernuum +
Illustrated  +
Allium columbianum +
Endemic  +
Allium constrictum +
Endemic  +, Conservation concern  +
Allium coryi +
Endemic  +
Allium cratericola +
Illustrated  +, Endemic  +
Allium crenulatum +
Endemic  +
Allium crispum +
Illustrated  +, Endemic  +
Allium cuthbertii +
Endemic  +
Allium denticulatum +
Endemic  +
Allium diabolense +
Endemic  +
Allium dichlamydeum +
Endemic  +
Allium dictuon +
Illustrated  +, Endemic  +, Conservation concern  +
Allium douglasii +
Endemic  +
Allium drummondii +
Illustrated  +
Allium elmendorfii +
Endemic  +, Conservation concern  +
Allium falcifolium +
Illustrated  +, Endemic  +
Allium fibrillum +
Endemic  +
Allium fimbriatum var. mohavense +
Endemic  +
Allium fimbriatum var. purdyi +
Endemic  +
Allium fistulosum +
Introduced  +
Allium geyeri +
W2  +, Illustrated  +, Endemic  +
Allium geyeri var. geyeri +
Illustrated  +, Endemic  +
Allium geyeri var. tenerum +
Illustrated  +, Endemic  +
Allium gooddingii +
Endemic  +
Allium haematochiton +
Illustrated  +
Allium hickmanii +
Illustrated  +, Endemic  +, Conservation concern  +
Allium hoffmanii +
Endemic  +
Allium howellii +
Illustrated  +, Endemic  +
Allium howellii var. clokeyi +
Illustrated  +, Endemic  +
Allium howellii var. howellii +
Endemic  +
Allium howellii var. sanbenitense +
Endemic  +
Allium hyalinum +
Illustrated  +, Endemic  +
Allium jepsonii +
Illustrated  +, Endemic  +, Conservation concern  +
Allium lacunosum +
Endemic  +
Allium lacunosum var. davisiae +
Endemic  +
Allium lacunosum var. kernensis +
Endemic  +
Allium lacunosum var. lacunosum +
Endemic  +
Allium lacunosum var. micranthum +
Endemic  +
Allium lemmonii +
Illustrated  +, Endemic  +
Allium macropetalum +
Endemic  +
Allium macrum +
Endemic  +
Allium madidum +
Endemic  +
Allium membranaceum +
Illustrated  +, Endemic  +
Allium monticola +
Endemic  +
Allium munzii +
Illustrated  +, Endemic  +, Conservation concern  +
Allium neapolitanum +
W2  +, Introduced  +
Allium nevadense +
Illustrated  +, Endemic  +
Allium nevii +
Illustrated  +, Endemic  +
Allium nigrum +
Introduced  +
Allium obtusum +
Endemic  +
Allium obtusum var. conspicuum +
Endemic  +
Allium obtusum var. obtusum +
Endemic  +
Allium oleraceum +
Introduced  +
Allium paniculatum var. paniculatum +
W2  +, Introduced  +
Allium parishii +
Endemic  +
Allium parvum +
Endemic  +
Allium passeyi +
Endemic  +, Conservation concern  +
Allium peninsulare var. franciscanum +
Endemic  +
Allium perdulce +
Endemic  +
Allium perdulce var. perdulce +
Endemic  +
Allium perdulce var. sperryi +
Endemic  +
Allium platycaule +
Illustrated  +, Endemic  +
Allium punctum +
Illustrated  +, Endemic  +
Allium robinsonii +
Endemic  +
Allium runyonii +
Endemic  +
Allium sanbornii +
Endemic  +
Allium sanbornii var. congdonii +
Endemic  +
Allium sanbornii var. sanbornii +
Endemic  +
Allium sativum +
Introduced  +
Allium sativum var. sativum +
Introduced  +
Allium schoenoprasum +
Illustrated  +
Allium scilloides +
Endemic  +, Conservation concern  +
Allium serra +
Endemic  +
Allium sharsmithiae +
Endemic  +, Conservation concern  +
Allium shevockii +
Illustrated  +, Endemic  +, Conservation concern  +
Allium simillimum +
Illustrated  +, Endemic  +
Allium siskiyouense +
Endemic  +
Allium stellatum +
Endemic  +
Allium textile +
W2  +, Illustrated  +, Endemic  +
Allium tolmiei +
Illustrated  +, Endemic  +
Allium tolmiei var. persimile +
Illustrated  +, Endemic  +
Allium tolmiei var. tolmiei +
Illustrated  +, Endemic  +
Allium tribracteatum +
Illustrated  +, Endemic  +, Conservation concern  +
Allium tricoccum +
Endemic  +
Allium tricoccum var. burdickii +
Endemic  +
Allium tricoccum var. tricoccum +
Endemic  +
Allium triquetrum +
Introduced  +
Allium tuolumnense +
Illustrated  +, Endemic  +, Conservation concern  +
Allium unifolium +
Endemic  +
Allium validum +
Endemic  +
Allium vineale +
W2  +, W1  +, Introduced  +
Allium yosemitense +
Illustrated  +, Endemic  +, Conservation concern  +
Alloteropsis cimicina +
Introduced  +
Allotropa virgata +
Illustrated  +, Endemic  +
Allowissadula holosericea +
Illustrated  +
Almutaster pauciflorus +
Illustrated  +
Alnus glutinosa +
W1  +
Alnus incana subsp. rugosa +
W1  +, Endemic  +
Alnus incana subsp. tenuifolia +
Endemic  +
Alnus maritima +
Endemic  +, Illustrated  +
Alnus rhombifolia +
Endemic  +
Alnus rubra +
W1  +, Endemic  +, Illustrated  +
Alnus serrulata +
Endemic  +
Alnus viridis subsp. crispa +
Endemic  +, Illustrated  +
Alnus viridis subsp. sinuata +
Endemic  +
Aloe vera +
Introduced  +, Illustrated  +
Alopecurus arundinaceus +
Introduced  +
Alopecurus carolinianus +
Endemic  +
Alopecurus creticus +
Introduced  +
Alopecurus myosuroides +
Introduced  +
Alopecurus pratensis +
Introduced  +
Alopecurus rendlei +
Introduced  +
Alopecurus saccatus +
Endemic  +
Alophia drummondii +
Illustrated  +
Alpinia zerumbet +
Introduced  +, Illustrated  +
Alsia californica +
Illustrated  +
Alstroemeria pulchella +
Introduced  +, Illustrated  +
Alternanthera brasiliana +
Introduced  +
Alternanthera caracasana +
Weedy  +, Introduced  +, Illustrated  +
Alternanthera ficoidea var. bettzickiana +
Introduced  +
Alternanthera flavescens +
Introduced  +
Alternanthera paronychioides +
Introduced  +
Alternanthera philoxeroides +
Weedy  +, Introduced  +, Illustrated  +
Alternanthera pungens +
Weedy  +, Introduced  +
Alternanthera sessilis +
Weedy  +, Introduced  +, Illustrated  +
Althaea +
Introduced  +
Althaea armeniaca +
Introduced  +
Althaea cannabina +
Introduced  +
Althaea hirsuta +
Introduced  +
Althaea officinalis +
Illustrated  +, Introduced  +
Alvaradoa amorphoides +
Illustrated  +
Alvaradoa amorphoides subsp. psilophylla +
Illustrated  +
Alyssum alyssoides +
Weedy  +, Introduced  +
Alyssum desertorum +
Weedy  +, Introduced  +
Alyssum murale +
Introduced  +
Amaranthus acanthochiton +
Illustrated  +
Amaranthus albus +
Weedy  +, Introduced  +, Illustrated  +
Amaranthus arenicola +
Weedy  +, Illustrated  +, Endemic  +
Amaranthus australis +
Weedy  +, Illustrated  +
Amaranthus blitoides +
Weedy  +, Illustrated  +
Amaranthus blitum +
Introduced  +, Illustrated  +
Amaranthus californicus +
Illustrated  +, Endemic  +
Amaranthus cannabinus +
Illustrated  +, Endemic  +
Amaranthus caudatus +
Introduced  +, Illustrated  +
Amaranthus crassipes +
Illustrated  +
Amaranthus crispus +
Introduced  +, Illustrated  +
Amaranthus deflexus +
Introduced  +, Illustrated  +
Amaranthus dubius +
Introduced  +
Amaranthus fimbriatus +
Weedy  +, Illustrated  +
Amaranthus floridanus +
Illustrated  +, Endemic  +
Amaranthus graecizans +
Introduced  +
Amaranthus greggii +
Illustrated  +
Amaranthus hybridus +
Weedy  +, Illustrated  +
Amaranthus muricatus +
Introduced  +
Amaranthus palmeri +
Weedy  +, Illustrated  +
Amaranthus powellii +
Weedy  +, Illustrated  +
Amaranthus pumilus +
Endemic  +, Conservation concern  +
Amaranthus retroflexus +
Weedy  +, Illustrated  +, Endemic  +
Amaranthus spinosus +
Weedy  +, Introduced  +, Illustrated  +
Amaranthus torreyi +
Weedy  +, Endemic  +
Amaranthus tricolor +
Introduced  +
Amaranthus tuberculatus +
Weedy  +, Introduced  +, Illustrated  +
Amaranthus viridis +
Weedy  +, Introduced  +, Illustrated  +
Amaranthus wrightii +
Endemic  +
Amauriopsis dissecta +
Illustrated  +
Amberboa moschata +
Introduced  +, Illustrated  +
Amblyodon dealbatus +
Illustrated  +
Amblyolepis setigera +
Illustrated  +
Amblyopappus pusillus +
Illustrated  +
Amblystegium serpens +
Illustrated  +
Ambrosia acanthicarpa +
Endemic  +
Ambrosia artemisiifolia +
Illustrated  +, Endemic  +
Ambrosia bidentata +
Endemic  +
Ambrosia eriocentra +
Illustrated  +, Endemic  +
Ambrosia grayi +
Endemic  +
Ambrosia linearis +
Endemic  +
Ambrosia salsola +
Illustrated  +
Ambrosia tomentosa +
Endemic  +
Ambrosia trifida +
Illustrated  +
Amelanchier +
Endemic  +
Amelanchier alnifolia +
Endemic  +
Amelanchier alnifolia var. alnifolia +
Endemic  +
Amelanchier alnifolia var. pumila +
Endemic  +
Amelanchier alnifolia var. semiintegrifolia +
Endemic  +
Amelanchier amabilis +
Endemic  +
Amelanchier arborea +
Endemic  +
Amelanchier bartramiana +
Endemic  +
Amelanchier canadensis +
Endemic  +
Amelanchier canadensis var. canadensis +
Endemic  +
Amelanchier canadensis var. obovalis +
Endemic  +
Amelanchier cusickii +
Endemic  +
Amelanchier fernaldii +
Endemic  +
Amelanchier gaspensis +
Endemic  +
Amelanchier humilis +
Endemic  +
Amelanchier interior +
Endemic  +
Amelanchier intermedia +
Endemic  +
Amelanchier laevis +
Endemic  +, Illustrated  +
Amelanchier nantucketensis +
Endemic  +, Illustrated  +
Amelanchier nitens +
Endemic  +
Amelanchier pallida +
Endemic  +
Amelanchier sanguinea +
Endemic  +, Illustrated  +
Amelanchier spicata +
Endemic  +
Amelanchier utahensis +
Illustrated  +
Amerorchis rotundifolia +
Illustrated  +, Endemic  +
Amianthium muscitoxicum +
Illustrated  +, Endemic  +
Ammophila arenaria +
Introduced  +
Ammophila breviligulata +
Endemic  +
Ammophila breviligulata subsp. breviligulata +
Endemic  +
Ammophila breviligulata subsp. champlainensis +
Endemic  +
Amoreuxia gonzalezii +
Conservation concern  +
Amoreuxia palmatifida +
Illustrated  +
Amoreuxia wrightii +
Illustrated  +
Ampelaster carolinianus +
Illustrated  +, Endemic  +
Ampelodesmos mauritanicus +
Introduced  +
Ampelopsis aconitifolia +
Introduced  +
Ampelopsis cordata +
Illustrated  +, Endemic  +
Ampelopsis glandulosa +
Introduced  +
Amphiachyris amoena +
Endemic  +
Amphiachyris dracunculoides +
Illustrated  +, Endemic  +
Amphicarpum muhlenbergianum +
Endemic  +
Amphidium californicum +
Endemic  +, Illustrated  +
Amphidium lapponicum +
Illustrated  +
Amphidium mougeotii +
Illustrated  +
Amphipappus fremontii +
Illustrated  +, Endemic  +
Amphipappus fremontii var. fremontii +
Illustrated  +, Endemic  +
Amphipappus fremontii var. spinosus +
Endemic  +
Amphiscirpus nevadensis +
Illustrated  +
Anacamptodon splachnoides +
Illustrated  +
Anacolia menziesii +
Illustrated  +
Anagallis arvensis +
Weedy  +, Introduced  +, Illustrated  +
Anagallis minima +
Illustrated  +
Anaphalis margaritacea +
Illustrated  +
Ancistrocactus scheeri +
Illustrated  +
Ancistrocarphus filagineus +
Illustrated  +
Andromeda polifolia +
Illustrated  +
Andromeda polifolia var. latifolia +
Illustrated  +
Andromeda polifolia var. polifolia +
Illustrated  +
Andropogon arctatus +
Endemic  +
Andropogon brachystachyus +
Endemic  +
Andropogon floridanus +
Endemic  +
Andropogon liebmannii +
Endemic  +
Andropogon tracyi +
Endemic  +
Androsace chamaejasme +
Illustrated  +
Androsace chamaejasme subsp. lehmanniana +
Illustrated  +, Endemic  +
Androsace occidentalis +
Illustrated  +, Endemic  +
Androsace septentrionalis +
Weedy  +, Illustrated  +
Androstephium breviflorum +
Illustrated  +, Endemic  +
Androstephium coeruleum +
Endemic  +
Anelsonia eurycarpa +
Illustrated  +, Endemic  +
Anemia adiantifolia +
Illustrated  +
Anemia mexicana +
Illustrated  +
Anemia wrightii +
Illustrated  +
Anemone acutiloba +
Endemic  +, Illustrated  +
Anemone americana +
Endemic  +, Illustrated  +
Anemone berlandieri +
Endemic  +, Illustrated  +
Anemone canadensis +
Endemic  +, Illustrated  +
Anemone caroliniana +
Endemic  +
Anemone cylindrica +
Endemic  +
Anemone deltoidea +
Endemic  +, Illustrated  +
Anemone drummondii var. lithophila +
Endemic  +
Anemone edwardsiana +
Endemic  +
Anemone edwardsiana var. edwardsiana +
Endemic  +
Anemone edwardsiana var. petraea +
Conservation concern  +, Endemic  +
Anemone grayi +
Endemic  +
Anemone lancifolia +
Endemic  +
Anemone lyallii +
Endemic  +
Anemone multiceps +
Endemic  +
Anemone multifida +
Illustrated  +
Anemone multifida var. multifida +
Illustrated  +
Anemone multifida var. saxicola +
Conservation concern  +, Endemic  +
Anemone multifida var. stylosa +
Conservation concern  +, Endemic  +
Anemone multifida var. tetonensis +
Endemic  +
Anemone narcissiflora +
Illustrated  +
Anemone narcissiflora var. monantha +
Illustrated  +
Anemone narcissiflora var. villosissima +
Illustrated  +
Anemone narcissiflora var. zephyra +
Endemic  +
Anemone occidentalis +
Endemic  +
Anemone okennonii +
Endemic  +
Anemone oregana +
Illustrated  +, Endemic  +
Anemone oregana var. felix +
Conservation concern  +, Endemic  +
Anemone oregana var. oregana +
Endemic  +, Illustrated  +
Anemone parviflora +
Illustrated  +
Anemone patens +
Illustrated  +
Anemone patens var. multifida +
Illustrated  +
Anemone piperi +
Endemic  +
Anemone quinquefolia +
Illustrated  +, Endemic  +
Anemone quinquefolia var. minima +
Endemic  +
Anemone quinquefolia var. quinquefolia +
Endemic  +, Illustrated  +
Anemone richardsonii +
Illustrated  +
Anemone tuberosa +
Illustrated  +
Anemone virginiana +
Illustrated  +, Endemic  +
Anemone virginiana var. alba +
Endemic  +
Anemone virginiana var. cylindroidea +
Endemic  +
Anemone virginiana var. virginiana +
Endemic  +, Illustrated  +
Anemopsis californica +
W2  +, Illustrated  +
Angelonia +
Introduced  +
Angelonia gardneri +
Introduced  +, Illustrated  +
Anisocarpus madioides +
Illustrated  +, Endemic  +
Anisocarpus scabridus +
Endemic  +, Conservation concern  +
Anisocoma acaulis +
Illustrated  +
Annona glabra +
Illustrated  +
Annona squamosa +
Introduced  +
Anoda abutiloides +
Illustrated  +
Anoda cristata +
Weedy  +
Anomobryum concinnatum +
Illustrated  +
Anomobryum julaceum +
Illustrated  +
Anomodon tristis +
Illustrated  +
Anredera cordifolia +
Introduced  +, Illustrated  +
Anredera vesicaria +
Illustrated  +
Antennaria anaphaloides +
Endemic  +
Antennaria arcuata +
Endemic  +, Conservation concern  +
Antennaria argentea +
Endemic  +
Antennaria aromatica +
Endemic  +
Antennaria corymbosa +
Endemic  +
Antennaria densifolia +
Endemic  +
Antennaria dimorpha +
Endemic  +
Antennaria flagellaris +
Illustrated  +, Endemic  +
Antennaria friesiana subsp. alaskana +
Endemic  +
Antennaria friesiana subsp. neoalaskana +
Endemic  +
Antennaria geyeri +
Illustrated  +, Endemic  +
Antennaria howellii +
Endemic  +
Antennaria howellii subsp. canadensis +
Endemic  +
Antennaria howellii subsp. howellii +
Endemic  +
Antennaria howellii subsp. neodioica +
Endemic  +
Antennaria howellii subsp. petaloidea +
Endemic  +
Antennaria lanata +
Illustrated  +, Endemic  +
Antennaria luzuloides +
Endemic  +
Antennaria luzuloides subsp. aberrans +
Endemic  +
Antennaria luzuloides subsp. luzuloides +
Endemic  +
Antennaria media +
Endemic  +
Antennaria microphylla +
Illustrated  +, Endemic  +
Antennaria monocephala +
Illustrated  +
Antennaria monocephala subsp. angustata +
Endemic  +
Antennaria monocephala subsp. monocephala +
Illustrated  +
Antennaria neglecta +
Endemic  +
Antennaria parlinii +
Endemic  +
Antennaria parlinii subsp. fallax +
Endemic  +
Antennaria parlinii subsp. parlinii +
Endemic  +
Antennaria plantaginifolia +
Illustrated  +, Endemic  +
Antennaria pulchella +
Endemic  +
Antennaria pulcherrima +
Endemic  +
Antennaria pulcherrima subsp. eucosma +
Endemic  +
Antennaria pulcherrima subsp. pulcherrima +
Endemic  +
Antennaria racemosa +
Endemic  +
Antennaria rosea +
Endemic  +
Antennaria rosea subsp. arida +
Endemic  +
Antennaria rosea subsp. confinis +
Endemic  +
Antennaria rosea subsp. pulvinata +
Endemic  +
Antennaria rosea subsp. rosea +
Endemic  +
Antennaria rosulata +
Endemic  +
Antennaria solitaria +
Endemic  +
Antennaria stenophylla +
Endemic  +
Antennaria suffrutescens +
Endemic  +
Antennaria umbrinella +
Illustrated  +, Endemic  +
Antennaria virginica +
Endemic  +
Anthemis arvensis +
Introduced  +, Illustrated  +
Anthemis cotula +
Introduced  +
Anthephora hermaphrodita +
Introduced  +
Anthoxanthum aristatum +
Introduced  +
Anthoxanthum odoratum +
Introduced  +
Antigonon leptopus +
Introduced  +, Illustrated  +
Antirrhinum +
Introduced  +
Antirrhinum majus +
Weedy  +, Introduced  +, Illustrated  +
Antitrichia californica +
Illustrated  +
Antitrichia curtipendula +
Illustrated  +
Anulocaulis annulatus +
Illustrated  +, Endemic  +
Anulocaulis leiosolenus +
Illustrated  +
Anulocaulis leiosolenus var. gypsogenus +
Endemic  +
Anulocaulis leiosolenus var. howardii +
Illustrated  +
Anulocaulis leiosolenus var. lasianthus +
Illustrated  +
Anulocaulis leiosolenus var. leiosolenus +
Illustrated  +
Anulocaulis reflexus +
Conservation concern  +
Apacheria +
Conservation concern  +, Endemic  +
Apacheria chiricahuensis +
Conservation concern  +, Endemic  +, Illustrated  +
Apera interrupta +
Introduced  +
Apera spica-venti +
Introduced  +
Aphanes arvensis +
Introduced  +
Aphanes australis +
Introduced  +
Aphanes occidentalis +
Illustrated  +
Aphanisma blitoides +
Illustrated  +, Conservation concern  +
Aphanostephus pilosus +
Endemic  +
Aphanostephus ramosissimus +
Illustrated  +
Aphanostephus ramosissimus var. humilis +
Illustrated  +
Aphanostephus ramosissimus var. ramosissimus +
Illustrated  +
Aphanostephus skirrhobasis var. skirrhobasis +
Endemic  +
Aphragmus eschscholtzianus +
Illustrated  +
Aplectrum hyemale +
Illustrated  +, Endemic  +
Aplodon wormskioldii +
Illustrated  +
Apodanthera undulata +
Illustrated  +
Apodanthera undulata var. undulata +
Illustrated  +
Aptenia cordifolia +
Introduced  +, Illustrated  +
Apteria aphylla +
Illustrated  +
Aquilegia barnebyi +
Endemic  +
Aquilegia brevistyla +
Endemic  +, Illustrated  +
Aquilegia canadensis +
Endemic  +, Illustrated  +
Aquilegia chaplinei +
Conservation concern  +, Endemic  +
Aquilegia chrysantha +
Illustrated  +
Aquilegia coerulea +
Endemic  +
Aquilegia coerulea var. alpina +
Conservation concern  +, Endemic  +
Aquilegia coerulea var. coerulea +
Endemic  +
Aquilegia coerulea var. ochroleuca +
Endemic  +
Aquilegia coerulea var. pinetorum +
Endemic  +
Aquilegia desertorum +
Endemic  +
Aquilegia elegantula +
Illustrated  +
Aquilegia eximia +
Endemic  +, Illustrated  +
Aquilegia flavescens +
Endemic  +, Illustrated  +
Aquilegia formosa +
Illustrated  +
Aquilegia formosa var. formosa +
Endemic  +
Aquilegia formosa var. hypolasia +
Illustrated  +
Aquilegia formosa var. truncata +
Endemic  +, Illustrated  +
Aquilegia hinckleyana +
Conservation concern  +, Endemic  +
Aquilegia jonesii +
Endemic  +, Illustrated  +
Aquilegia laramiensis +
Conservation concern  +, Endemic  +
Aquilegia micrantha +
Endemic  +, Illustrated  +
Aquilegia pubescens +
Endemic  +, Illustrated  +
Aquilegia saximontana +
Conservation concern  +, Endemic  +, Illustrated  +
Aquilegia scopulorum +
Endemic  +, Illustrated  +
Aquilegia shockleyi +
Endemic  +
Aquilegia vulgaris +
W1  +, Introduced  +
Arabidopsis thaliana +
Weedy  +, Introduced  +
Arabis aculeolata +
Endemic  +
Arabis blepharophylla +
Illustrated  +, Endemic  +
Arabis caucasica +
Introduced  +
Arabis crucisetosa +
Endemic  +
Arabis eschscholtziana +
Endemic  +
Arabis furcata +
Endemic  +
Arabis georgiana +
Endemic  +, Conservation concern  +
Arabis mcdonaldiana +
Endemic  +, Conservation concern  +
Arabis modesta +
Endemic  +
Arabis nuttallii +
Endemic  +
Arabis olympica +
Endemic  +
Arabis oregana +
Endemic  +
Arabis patens +
Endemic  +
Arachniodes simplicior +
Introduced  +, Illustrated  +
Arbutus menziesii +
Illustrated  +, Endemic  +
Arceuthobium americanum +
Illustrated  +, Endemic  +
Arceuthobium campylopodum +
Illustrated  +
Arceuthobium campylopodum subsp. abietinum +
Illustrated  +
Arceuthobium campylopodum subsp. apachecum +
Illustrated  +
Arceuthobium campylopodum subsp. blumeri +
Illustrated  +
Arceuthobium campylopodum subsp. californicum +
Endemic  +
Arceuthobium campylopodum subsp. campylopodum +
Illustrated  +
Arceuthobium campylopodum subsp. cyanocarpum +
Endemic  +
Arceuthobium campylopodum subsp. laricis +
Endemic  +
Arceuthobium campylopodum subsp. littorum +
Endemic  +
Arceuthobium campylopodum subsp. microcarpum +
Endemic  +
Arceuthobium campylopodum subsp. monticola +
Endemic  +
Arceuthobium campylopodum subsp. occidentale +
Endemic  +
Arceuthobium campylopodum subsp. siskiyouense +
Endemic  +
Arceuthobium campylopodum subsp. tsugense +
Endemic  +
Arceuthobium pusillum +
Illustrated  +, Endemic  +
Arctanthemum arcticum +
Illustrated  +
Arctanthemum arcticum subsp. arcticum +
Illustrated  +
Arctanthemum arcticum subsp. polare +
Illustrated  +
Arctium lappa +
Introduced  +
Arctium minus +
Introduced  +, Illustrated  +
Arctium tomentosum +
Introduced  +
Arctomecon californica +
Conservation concern  +, Endemic  +, Illustrated  +
Arctomecon humilis +
Conservation concern  +, Endemic  +, Illustrated  +
Arctomecon merriamii +
Endemic  +, Conservation concern  +
Arctostaphylos andersonii +
Endemic  +, Conservation concern  +
Arctostaphylos auriculata +
Endemic  +, Conservation concern  +
Arctostaphylos bakeri +
Endemic  +, Conservation concern  +
Arctostaphylos bakeri subsp. bakeri +
Endemic  +, Conservation concern  +
Arctostaphylos bakeri subsp. sublaevis +
Endemic  +, Conservation concern  +
Arctostaphylos canescens +
Illustrated  +, Endemic  +
Arctostaphylos canescens subsp. canescens +
Illustrated  +, Endemic  +
Arctostaphylos canescens subsp. sonomensis +
Endemic  +
Arctostaphylos catalinae +
Endemic  +, Conservation concern  +
Arctostaphylos columbiana +
Illustrated  +, Endemic  +
Arctostaphylos confertiflora +
Endemic  +, Conservation concern  +
Arctostaphylos cruzensis +
Endemic  +, Conservation concern  +
Arctostaphylos densiflora +
Endemic  +, Conservation concern  +
Arctostaphylos edmundsii +
Endemic  +, Conservation concern  +
Arctostaphylos franciscana +
Endemic  +, Conservation concern  +
Arctostaphylos glandulosa +
Illustrated  +
Arctostaphylos glandulosa subsp. adamsii +
Conservation concern  +
Arctostaphylos glandulosa subsp. crassifolia +
Conservation concern  +
Arctostaphylos glandulosa subsp. cushingiana +
Illustrated  +
Arctostaphylos glandulosa subsp. gabrielensis +
Illustrated  +
Arctostaphylos glandulosa subsp. glandulosa +
Illustrated  +
Arctostaphylos glandulosa subsp. howellii +
Illustrated  +
Arctostaphylos glandulosa subsp. leucophylla +
Illustrated  +
Arctostaphylos glandulosa subsp. mollis +
Endemic  +
Arctostaphylos glauca +
Illustrated  +
Arctostaphylos glutinosa +
Endemic  +, Conservation concern  +
Arctostaphylos hispidula +
Endemic  +
Arctostaphylos hookeri +
Endemic  +
Arctostaphylos hookeri subsp. hearstiorum +
Endemic  +
Arctostaphylos hookeri subsp. hookeri +
Endemic  +
Arctostaphylos hooveri +
Endemic  +, Conservation concern  +
Arctostaphylos imbricata +
Endemic  +, Conservation concern  +
Arctostaphylos insularis +
Endemic  +, Conservation concern  +
Arctostaphylos klamathensis +
Endemic  +, Conservation concern  +
Arctostaphylos luciana +
Endemic  +, Conservation concern  +
Arctostaphylos malloryi +
Endemic  +, Conservation concern  +
Arctostaphylos manzanita +
Endemic  +
Arctostaphylos manzanita subsp. elegans +
Endemic  +
Arctostaphylos manzanita subsp. glaucescens +
Endemic  +
Arctostaphylos manzanita subsp. laevigata +
Endemic  +
Arctostaphylos manzanita subsp. manzanita +
Endemic  +
Arctostaphylos manzanita subsp. roofii +
Endemic  +
Arctostaphylos manzanita subsp. wieslanderi +
Endemic  +
Arctostaphylos mewukka +
Endemic  +
Arctostaphylos mewukka subsp. mewukka +
Endemic  +
Arctostaphylos mewukka subsp. truei +
Endemic  +
Arctostaphylos montaraensis +
Endemic  +, Conservation concern  +
Arctostaphylos montereyensis +
Endemic  +, Conservation concern  +
Arctostaphylos morroensis +
Endemic  +, Conservation concern  +
Arctostaphylos myrtifolia +
Endemic  +, Conservation concern  +
Arctostaphylos nevadensis +
Endemic  +
Arctostaphylos nevadensis subsp. knightii +
Endemic  +
Arctostaphylos nevadensis subsp. nevadensis +
Endemic  +
Arctostaphylos nissenana +
Endemic  +, Conservation concern  +
Arctostaphylos nortensis +
Endemic  +, Conservation concern  +
Arctostaphylos nummularia +
Endemic  +, Conservation concern  +
Arctostaphylos nummularia subsp. mendocinoensis +
Endemic  +, Conservation concern  +
Arctostaphylos nummularia subsp. nummularia +
Endemic  +, Conservation concern  +
Arctostaphylos obispoensis +
Endemic  +
Arctostaphylos otayensis +
Endemic  +, Conservation concern  +
Arctostaphylos pacifica +
Endemic  +, Conservation concern  +
Arctostaphylos pajaroensis +
Illustrated  +, Endemic  +, Conservation concern  +
Arctostaphylos pallida +
Endemic  +, Conservation concern  +
Arctostaphylos parryana +
Endemic  +
Arctostaphylos parryana subsp. desertica +
Endemic  +
Arctostaphylos parryana subsp. parryana +
Endemic  +
Arctostaphylos parryana subsp. tumescens +
Endemic  +
Arctostaphylos patula +
Illustrated  +
Arctostaphylos pilosula +
Endemic  +, Conservation concern  +
Arctostaphylos pringlei +
Illustrated  +
Arctostaphylos pringlei subsp. drupacea +
Illustrated  +
Arctostaphylos pringlei subsp. pringlei +
Illustrated  +
Arctostaphylos pumila +
Endemic  +, Conservation concern  +
Arctostaphylos pungens +
Illustrated  +
Arctostaphylos purissima +
Endemic  +, Conservation concern  +
Arctostaphylos rainbowensis +
Endemic  +, Conservation concern  +
Arctostaphylos refugioensis +
Endemic  +, Conservation concern  +
Arctostaphylos regismontana +
Endemic  +, Conservation concern  +
Arctostaphylos rudis +
Endemic  +, Conservation concern  +
Arctostaphylos silvicola +
Endemic  +, Conservation concern  +
Arctostaphylos stanfordiana +
Illustrated  +, Endemic  +
Arctostaphylos stanfordiana subsp. decumbens +
Endemic  +, Conservation concern  +
Arctostaphylos stanfordiana subsp. raichei +
Endemic  +, Conservation concern  +
Arctostaphylos stanfordiana subsp. stanfordiana +
Illustrated  +, Endemic  +
Arctostaphylos tomentosa +
Endemic  +
Arctostaphylos tomentosa subsp. bracteosa +
Endemic  +, Conservation concern  +
Arctostaphylos tomentosa subsp. daciticola +
Endemic  +, Conservation concern  +
Arctostaphylos tomentosa subsp. hebeclada +
Endemic  +
Arctostaphylos tomentosa subsp. tomentosa +
Endemic  +
Arctostaphylos uva-ursi +
Illustrated  +
Arctostaphylos virgata +
Endemic  +, Conservation concern  +
Arctostaphylos viridissima +
Endemic  +, Conservation concern  +
Arctostaphylos viscida +
Illustrated  +, Endemic  +
Arctostaphylos viscida subsp. mariposa +
Endemic  +
Arctostaphylos viscida subsp. pulchella +
Endemic  +
Arctostaphylos viscida subsp. viscida +
Illustrated  +, Endemic  +
Arctotheca calendula +
Weedy  +, Introduced  +, Illustrated  +
Arctotis fastuosa +
Introduced  +
Arctotis stoechadifolia +
Introduced  +, Illustrated  +
Ardisia crenata +
Introduced  +, Illustrated  +
Ardisia elliptica +
Weedy  +, Introduced  +
Ardisia escallonioides +
Weedy  +, Introduced  +
Arenaria benthamii +
Illustrated  +
Arenaria lanuginosa +
Illustrated  +
Arenaria lanuginosa var. lanuginosa +
Illustrated  +
Arenaria lanuginosa var. saxosa +
Illustrated  +
Arenaria livermorensis +
Endemic  +, Conservation concern  +
Arenaria paludicola +
Conservation concern  +
Arenaria serpyllifolia +
Weedy  +, Introduced  +
Arenaria serpyllifolia var. serpyllifolia +
Weedy  +, Introduced  +
Arenaria serpyllifolia var. tenuior +
Weedy  +, Introduced  +
Arethusa bulbosa +
Illustrated  +, Endemic  +
Argemone albiflora +
W2  +, Endemic  +
Argemone albiflora subsp. albiflora +
Endemic  +
Argemone albiflora subsp. texana +
Endemic  +
Argemone arizonica +
Conservation concern  +, Endemic  +, Illustrated  +
Argemone aurantiaca +
Endemic  +
Argemone corymbosa +
Endemic  +
Argemone corymbosa subsp. arenicola +
Endemic  +
Argemone corymbosa subsp. corymbosa +
Endemic  +
Argemone hispida +
Endemic  +, Illustrated  +
Argemone mexicana +
W2  +, Illustrated  +
Argemone munita +
Illustrated  +
Argemone munita subsp. argentea +
Endemic  +
Argemone munita subsp. munita +
Illustrated  +
Argemone munita subsp. robusta +
Endemic  +, Conservation concern  +
Argemone munita subsp. rotundata +
Illustrated  +, Endemic  +
Argemone ochroleuca +
Illustrated  +, Introduced  +
Argemone pleiacantha +
Illustrated  +
Argemone pleiacantha subsp. ambigua +
Endemic  +
Argemone pleiacantha subsp. pinnatisecta +
Conservation concern  +, Endemic  +, Illustrated  +
Argemone pleiacantha subsp. pleiacantha +
Illustrated  +
Argemone polyanthemos +
W2  +, Endemic  +, Illustrated  +
Argemone squarrosa +
W2  +, Illustrated  +, Endemic  +
Argemone squarrosa subsp. glabrata +
Endemic  +
Argemone squarrosa subsp. squarrosa +
Endemic  +, Illustrated  +
Argyranthemum foeniculaceum +
Introduced  +, Illustrated  +
Argyrochosma dealbata +
Endemic  +
Argyrochosma fendleri +
Illustrated  +
Argyrochosma jonesii +
Illustrated  +
Argythamnia adenophora +
Illustrated  +
Argythamnia aphoroides +
Endemic  +, Conservation concern  +
Argythamnia argyraea +
Endemic  +, Conservation concern  +
Argythamnia claryana +
Endemic  +
Argythamnia cyanophylla +
Illustrated  +, Endemic  +
Argythamnia humilis +
Illustrated  +
Argythamnia mercurialina +
Endemic  +
Argythamnia mercurialina var. mercurialina +
Endemic  +
Argythamnia mercurialina var. pilosissima +
Endemic  +
Arida arizonica +
Illustrated  +
Ariocarpus fissuratus +
Illustrated  +
Ariocarpus fissuratus var. fissuratus +
Illustrated  +
Arisaema dracontium +
Illustrated  +
Arisaema triphyllum +
Illustrated  +, Endemic  +
Aristida basiramea +
Endemic  +
Aristida condensata +
Endemic  +
Aristida desmantha +
Endemic  +
Aristida dichotoma +
Endemic  +
Aristida dichotoma var. curtissii +
Endemic  +
Aristida dichotoma var. dichotoma +
Endemic  +
Aristida gyrans +
Endemic  +
Aristida lanosa +
Endemic  +
Aristida longespica +
Endemic  +
Aristida longespica var. geniculata +
Endemic  +
Aristida longespica var. longespica +
Endemic  +
Aristida palustris +
Endemic  +
Aristida patula +
Endemic  +
Aristida purpurascens var. virgata +
Endemic  +
Aristida ramosissima +
Endemic  +
Aristida rhizomophora +
Endemic  +
Aristida simpliciflora +
Endemic  +
Aristida stricta +
Endemic  +
Aristida tuberculosa +
Endemic  +
Aristocapsa insignis +
Illustrated  +, Endemic  +, Conservation concern  +
Aristolochia californica +
Endemic  +
Aristolochia clematitis +
Introduced  +
Aristolochia erecta +
Illustrated  +
Aristolochia macrophylla +
Endemic  +, Illustrated  +
Aristolochia maxima +
Introduced  +
Aristolochia pentandra +
Endemic  +
Aristolochia reticulata +
Endemic  +, Illustrated  +
Aristolochia serpentaria +
Endemic  +
Aristolochia tomentosa +
Endemic  +
Armeria maritima +
Illustrated  +
Armeria maritima subsp. californica +
Illustrated  +, Endemic  +
Armeria maritima subsp. interior +
Endemic  +
Armeria maritima subsp. maritima +
Illustrated  +
Armeria maritima subsp. sibirica +
Endemic  +
Armoracia rusticana +
Weedy  +, Introduced  +, Illustrated  +
Arnica acaulis +
Endemic  +
Arnica angustifolia subsp. tomentosa +
Endemic  +
Arnica cernua +
Endemic  +
Arnica chamissonis +
Endemic  +
Arnica cordifolia +
Illustrated  +, Endemic  +
Arnica dealbata +
Endemic  +
Arnica discoidea +
Endemic  +
Arnica fulgens +
Endemic  +
Arnica gracilis +
Endemic  +
Arnica lanceolata +
Endemic  +
Arnica lanceolata subsp. lanceolata +
Endemic  +
Arnica lanceolata subsp. prima +
Endemic  +
Arnica latifolia +
Illustrated  +, Endemic  +
Arnica lonchophylla +
Endemic  +
Arnica longifolia +
Endemic  +
Arnica louiseana +
Endemic  +
Arnica mollis +
Illustrated  +, Endemic  +
Arnica nevadensis +
Endemic  +
Arnica ovata +
Endemic  +
Arnica parryi +
Illustrated  +, Endemic  +
Arnica rydbergii +
Endemic  +
Arnica sororia +
Endemic  +
Arnica spathulata +
Endemic  +
Arnica venosa +
Endemic  +
Arnica viscosa +
Endemic  +
Arnoglossum atriplicifolium +
Endemic  +
Arnoglossum diversifolium +
Endemic  +, Conservation concern  +
Arnoglossum floridanum +
Endemic  +, Conservation concern  +
Arnoglossum ovatum +
Endemic  +
Arnoglossum plantagineum +
Illustrated  +, Endemic  +
Arnoglossum reniforme +
Endemic  +
Arnoglossum sulcatum +
Endemic  +, Conservation concern  +
Arnoseris minima +
Introduced  +, Illustrated  +
Aronia +
Endemic  +
Aronia arbutifolia +
Endemic  +
Aronia melanocarpa +
Endemic  +, Illustrated  +
Arrhenatherum elatius +
Introduced  +
Arrhenopterum heterostichum +
Illustrated  +
Artemisia abrotanum +
Introduced  +
Artemisia absinthium +
Introduced  +
Artemisia alaskana +
Endemic  +
Artemisia aleutica +
Endemic  +, Conservation concern  +
Artemisia annua +
Introduced  +
Artemisia arbuscula +
Endemic  +
Artemisia arbuscula subsp. arbuscula +
Endemic  +
Artemisia arbuscula subsp. longiloba +
Endemic  +
Artemisia arbuscula subsp. thermopola +
Endemic  +
Artemisia biennis +
Endemic  +
Artemisia bigelovii +
Endemic  +
Artemisia borealis subsp. richardsoniana +
Endemic  +
Artemisia campestris +
Illustrated  +
Artemisia campestris subsp. canadensis +
Illustrated  +, Endemic  +
Artemisia campestris subsp. caudata +
Endemic  +
Artemisia campestris subsp. pacifica +
Endemic  +
Artemisia cana +
Illustrated  +, Endemic  +
Artemisia cana subsp. bolanderi +
Endemic  +
Artemisia cana subsp. cana +
Illustrated  +, Endemic  +
Artemisia cana subsp. viscidula +
Endemic  +
Artemisia douglasiana +
Endemic  +
Artemisia dracunculus +
Illustrated  +
Artemisia filifolia +
Endemic  +
Artemisia frigida +
Illustrated  +
Artemisia globularia subsp. lutea +
Endemic  +
Artemisia glomerata +
Endemic  +
Artemisia laciniata subsp. parryi +
Endemic  +
Artemisia longifolia +
Endemic  +
Artemisia ludoviciana +
Illustrated  +
Artemisia ludoviciana subsp. albula +
Illustrated  +
Artemisia ludoviciana subsp. candicans +
Endemic  +
Artemisia ludoviciana subsp. incompta +
Illustrated  +
Artemisia ludoviciana subsp. ludoviciana +
Illustrated  +, Endemic  +
Artemisia ludoviciana subsp. mexicana +
Illustrated  +
Artemisia ludoviciana subsp. redolens +
Illustrated  +
Artemisia michauxiana +
Endemic  +
Artemisia nesiotica +
Endemic  +
Artemisia norvegica +
Illustrated  +
Artemisia norvegica subsp. saxatilis +
Illustrated  +
Artemisia nova +
Endemic  +
Artemisia packardiae +
Endemic  +, Conservation concern  +
Artemisia papposa +
Endemic  +
Artemisia pattersonii +
Endemic  +
Artemisia pedatifida +
Endemic  +
Artemisia pontica +
Introduced  +
Artemisia porteri +
Endemic  +
Artemisia pycnocephala +
Endemic  +
Artemisia pygmaea +
Illustrated  +, Endemic  +
Artemisia rigida +
Endemic  +
Artemisia rothrockii +
Endemic  +
Artemisia scopulorum +
Endemic  +
Artemisia senjavinensis +
Illustrated  +
Artemisia serrata +
Endemic  +
Artemisia spiciformis +
Endemic  +
Artemisia suksdorfii +
Endemic  +
Artemisia tridentata +
Illustrated  +
Artemisia tridentata subsp. parishii +
Illustrated  +
Artemisia tridentata subsp. tridentata +
Illustrated  +, Endemic  +
Artemisia tridentata subsp. vaseyana +
Endemic  +
Artemisia tridentata subsp. wyomingensis +
Endemic  +
Artemisia tripartita +
Illustrated  +, Endemic  +
Artemisia tripartita subsp. rupicola +
Illustrated  +, Endemic  +
Artemisia tripartita subsp. tripartita +
Illustrated  +, Endemic  +
Artemisia vulgaris +
Introduced  +
Arthraxon hispidus +
Introduced  +
Arthrocnemum subterminale +
Illustrated  +
Aruncus dioicus +
Illustrated  +
Aruncus dioicus var. acuminatus +
Endemic  +, Illustrated  +
Aruncus dioicus var. dioicus +
Illustrated  +, Endemic  +
Aruncus dioicus var. pubescens +
Endemic  +
Aruncus dioicus var. vulgaris +
Introduced  +
Arundinaria gigantea +
Endemic  +
Arundinaria tecta +
Endemic  +
Arundo donax +
Introduced  +
Asanthus squamulosus +
Illustrated  +
Asarum canadense +
Endemic  +, Illustrated  +
Asarum caudatum +
Endemic  +, Illustrated  +
Asarum hartwegii +
Endemic  +, Illustrated  +
Asarum lemmonii +
Endemic  +
Asarum marmoratum +
Endemic  +
Asarum wagneri +
Endemic  +
Asimina incana +
W1  +, Endemic  +
Asimina longifolia +
Endemic  +
Asimina longifolia var. longifolia +
Endemic  +
Asimina longifolia var. spatulata +
Endemic  +
Asimina obovata +
Endemic  +, Illustrated  +
Asimina parviflora +
Endemic  +
Asimina pygmaea +
Endemic  +, Illustrated  +
Asimina reticulata +
W1  +, Endemic  +
Asimina tetramera +
Conservation concern  +, Endemic  +, Illustrated  +
Asimina triloba +
W1  +, Endemic  +, Illustrated  +
Asparagus aethiopicus +
Introduced  +
Asparagus asparagoides +
Introduced  +, Illustrated  +
Asparagus officinalis +
W2  +, Introduced  +, Illustrated  +
Asparagus setaceus +
Introduced  +
Asphodelus fistulosus +
Introduced  +, Illustrated  +
Aspicarpa hyssopifolia +
Illustrated  +
Aspidotis californica +
Illustrated  +
Aspidotis carlotta-halliae +
Endemic  +
Aspidotis densa +
Endemic  +
Asplenium bradleyi +
Endemic  +
Asplenium ebenoides +
Illustrated  +, Endemic  +
Asplenium montanum +
Illustrated  +, Endemic  +
Asplenium pinnatifidum +
Endemic  +
Asplenium platyneuron +
Illustrated  +
Asplenium rhizophyllum +
Illustrated  +, Endemic  +
Asplenium ruta-muraria +
Illustrated  +
Asplenium serratum +
Illustrated  +
Asplenium trichomanes +
Illustrated  +
Asplenium trichomanes subsp. quadrivalens +
Illustrated  +
Asplenium trichomanes subsp. trichomanes +
Illustrated  +
Asplenium verecundum +
Illustrated  +, Endemic  +
Aster alpinus +
Illustrated  +
Aster alpinus subsp. vierhapperi +
Illustrated  +
Aster tataricus +
Introduced  +
Astilbe biternata +
Illustrated  +, Endemic  +
Astraea +
Introduced  +
Astraea lobata +
Weedy  +, Introduced  +, Illustrated  +
Astranthium ciliatum +
Illustrated  +
Astranthium integrifolium +
Endemic  +
Astranthium robustum +
Endemic  +
Astrophytum asterias +
Illustrated  +, Conservation concern  +
Atamisquea emarginata +
Illustrated  +
Athyrium filix-femina +
Illustrated  +
Athyrium filix-femina var. angustum +
Illustrated  +, Endemic  +
Athyrium filix-femina var. asplenioides +
Endemic  +
Athyrium filix-femina var. californicum +
Endemic  +
Athyrium filix-femina var. cyclosorum +
Endemic  +
Athysanus pusillus +
Illustrated  +
Atrichoseris platyphylla +
Illustrated  +
Atriplex argentea var. argentea +
Endemic  +
Atriplex argentea var. hillmanii +
Endemic  +
Atriplex argentea var. longitrichoma +
Endemic  +
Atriplex argentea var. rydbergii +
Endemic  +
Atriplex canescens +
Weedy  +, Illustrated  +
Atriplex canescens var. canescens +
Illustrated  +
Atriplex canescens var. gigantea +
Endemic  +
Atriplex canescens var. laciniata +
Weedy  +, Illustrated  +
Atriplex canescens var. macilenta +
Endemic  +
Atriplex confertifolia +
Weedy  +, Endemic  +
Atriplex cordulata +
Endemic  +, Conservation concern  +
Atriplex cordulata var. cordulata +
Endemic  +, Conservation concern  +
Atriplex cordulata var. erecticaulis +
Endemic  +, Conservation concern  +
Atriplex coronata +
Endemic  +
Atriplex coronata var. coronata +
Endemic  +
Atriplex coronata var. notatior +
Endemic  +
Atriplex coronata var. vallicola +
Endemic  +, Conservation concern  +
Atriplex corrugata +
Endemic  +
Atriplex coulteri +
Endemic  +, Conservation concern  +
Atriplex covillei +
Endemic  +
Atriplex dioica +
Illustrated  +, Endemic  +
Atriplex elegans +
Weedy  +, Illustrated  +
Atriplex elegans var. elegans +
Illustrated  +
Atriplex elegans var. fasciculata +
Weedy  +
Atriplex fruticulosa +
Endemic  +
Atriplex gardneri +
Illustrated  +, Endemic  +
Atriplex gardneri var. aptera +
Endemic  +
Atriplex gardneri var. bonnevillensis +
Endemic  +, Conservation concern  +
Atriplex gardneri var. cuneata +
Illustrated  +, Endemic  +
Atriplex gardneri var. falcata +
Endemic  +
Atriplex gardneri var. gardneri +
Illustrated  +, Endemic  +
Atriplex gardneri var. utahensis +
Endemic  +
Atriplex gardneri var. welshii +
Endemic  +
Atriplex garrettii +
Endemic  +
Atriplex garrettii var. garrettii +
Endemic  +
Atriplex garrettii var. navajoensis +
Endemic  +
Atriplex glabriuscula var. acadiensis +
Endemic  +
Atriplex glabriuscula var. franktonii +
Endemic  +
Atriplex glabriuscula var. glabriuscula +
Introduced  +
Atriplex gmelinii +
Illustrated  +, Endemic  +
Atriplex gmelinii var. alaskensis +
Endemic  +
Atriplex gmelinii var. gmelinii +
Illustrated  +, Endemic  +
Atriplex graciliflora +
Illustrated  +, Endemic  +
Atriplex heterosperma +
Introduced  +
Atriplex holocarpa +
Introduced  +
Atriplex hortensis +
Introduced  +, Illustrated  +
Atriplex hymenelytra +
Illustrated  +, Endemic  +
Atriplex klebergorum +
Endemic  +, Conservation concern  +
Atriplex laciniata +
Introduced  +
Atriplex lentiformis +
Illustrated  +, Endemic  +
Atriplex lindleyi +
Introduced  +
Atriplex littoralis +
Introduced  +
Atriplex mucronata +
Endemic  +
Atriplex nudicaulis +
Endemic  +
Atriplex nummularia +
Introduced  +
Atriplex oblongifolia +
Introduced  +
Atriplex obovata +
Illustrated  +
Atriplex parishii +
Endemic  +, Conservation concern  +
Atriplex parishii var. depressa +
Endemic  +, Conservation concern  +
Atriplex parishii var. minuscula +
Endemic  +, Conservation concern  +
Atriplex parishii var. parishii +
Endemic  +, Conservation concern  +
Atriplex parishii var. persistens +
Endemic  +, Conservation concern  +
Atriplex parishii var. subtilis +
Endemic  +, Conservation concern  +
Atriplex parryi +
Endemic  +
Atriplex patula +
Introduced  +, Illustrated  +
Atriplex phyllostegia +
Illustrated  +, Endemic  +
Atriplex pleiantha +
Illustrated  +, Endemic  +
Atriplex powellii +
Endemic  +
Atriplex powellii var. minuticarpa +
Endemic  +
Atriplex powellii var. powellii +
Endemic  +
Atriplex prostrata +
Introduced  +, Illustrated  +
Atriplex pusilla +
Endemic  +
Atriplex rosea +
Weedy  +, Introduced  +, Illustrated  +
Atriplex saccaria +
Illustrated  +, Endemic  +
Atriplex saccaria var. asterocarpa +
Endemic  +
Atriplex saccaria var. cornuta +
Endemic  +
Atriplex saccaria var. saccaria +
Illustrated  +, Endemic  +
Atriplex semibaccata +
Weedy  +, Introduced  +, Illustrated  +
Atriplex serenana var. davidsonii +
Endemic  +
Atriplex spinifera +
Endemic  +
Atriplex suberecta +
Introduced  +
Atriplex suckleyi +
Endemic  +
Atriplex tatarica +
Introduced  +
Atriplex torreyi +
Endemic  +
Atriplex torreyi var. griffithsii +
Endemic  +
Atriplex torreyi var. torreyi +
Endemic  +
Atriplex truncata +
Illustrated  +, Endemic  +
Atriplex tularensis +
Endemic  +, Conservation concern  +
Atriplex watsonii +
Illustrated  +
Atriplex wolfii +
Endemic  +
Atriplex wolfii var. tenuissima +
Endemic  +
Atriplex wolfii var. wolfii +
Endemic  +
Aubrieta deltoidea +
Introduced  +, Illustrated  +
Aucuba +
Introduced  +
Aucuba japonica +
Introduced  +, Illustrated  +
Aulacomnium androgynum +
Endemic  +, Illustrated  +
Aulacomnium palustre +
Illustrated  +
Aulacomnium turgidum +
Illustrated  +
Aureolaria flava +
Endemic  +
Aureolaria grandiflora +
Endemic  +
Aureolaria levigata +
Endemic  +
Aureolaria patula +
Endemic  +
Aureolaria pectinata +
Endemic  +
Aureolaria pedicularia +
Endemic  +
Aureolaria virginica +
Illustrated  +, Endemic  +
Aurinia petraea +
Introduced  +
Aurinia saxatilis +
Introduced  +, Illustrated  +
Axonopus furcatus +
Endemic  +
Axyris amaranthoides +
Weedy  +, Introduced  +, Illustrated  +
Ayenia filiformis +
Illustrated  +
Ayenia limitaris +
Conservation concern  +
Azolla caroliniana +
Illustrated  +
Azolla filiculoides +
Illustrated  +
Azolla mexicana +
Illustrated  +
B
Baccharis angustifolia +
Endemic  +
Baccharis glomeruliflora +
Endemic  +
Baccharis halimifolia +
Illustrated  +
Baccharis malibuensis +
Endemic  +, Conservation concern  +
Baccharis pilularis subsp. pilularis +
Endemic  +
Baccharis plummerae +
Endemic  +
Baccharis plummerae subsp. glabrata +
Endemic  +, Conservation concern  +
Baccharis plummerae subsp. plummerae +
Endemic  +
Baccharis salicifolia +
Illustrated  +
Baccharis salicina +
Endemic  +
Baccharis sarothroides +
Illustrated  +
Baccharis vanessae +
Endemic  +, Conservation concern  +
Bacopa caroliniana +
Weedy  +, Endemic  +
Bacopa egensis +
Introduced  +
Bacopa eisenii +
Weedy  +, Endemic  +
Bacopa innominata +
Weedy  +, Endemic  +
Bacopa monnieri +
Weedy  +, Illustrated  +
Bacopa repens +
Weedy  +, Introduced  +
Bacopa rotundifolia +
Weedy  +, Illustrated  +, Endemic  +
Bahia absinthifolia +
Illustrated  +
Bahia bigelovii +
Endemic  +
Bahia biternata +
Endemic  +
Bahiopsis parishii +
Illustrated  +
Bahiopsis reticulata +
Endemic  +
Baileya multiradiata +
Illustrated  +
Balduina angustifolia +
Illustrated  +, Endemic  +
Balduina atropurpurea +
Endemic  +
Balduina uniflora +
Endemic  +
Balsamorhiza careyana +
Endemic  +
Balsamorhiza deltoidea +
Endemic  +
Balsamorhiza hispidula +
Endemic  +
Balsamorhiza hookeri +
Endemic  +
Balsamorhiza incana +
Endemic  +
Balsamorhiza lanata +
Endemic  +, Conservation concern  +
Balsamorhiza macrolepis +
Endemic  +, Conservation concern  +
Balsamorhiza macrophylla +
Endemic  +
Balsamorhiza rosea +
Illustrated  +, Endemic  +
Balsamorhiza sagittata +
Illustrated  +, Endemic  +
Balsamorhiza sericea +
Endemic  +
Balsamorhiza serrata +
Endemic  +
Bambusa bambos +
Introduced  +
Bambusa multiplex +
Introduced  +
Bambusa vulgaris +
Introduced  +
Barbarea orthoceras +
Illustrated  +
Barbarea stricta +
Introduced  +
Barbarea verna +
Introduced  +
Barbarea vulgaris +
Weedy  +, Introduced  +
Barbella pendula +
Illustrated  +
Barkleyanthus salicifolius +
Illustrated  +
Bartlettia scaposa +
Illustrated  +
Bartramia ithyphylla +
Illustrated  +
Bartramia pomiformis +
Illustrated  +
Bartramia stricta +
Illustrated  +
Bartsia alpina +
Illustrated  +
Basiphyllaea corallicola +
Illustrated  +, Conservation concern  +
Bassia hirsuta +
Introduced  +
Bassia hyssopifolia +
Weedy  +, Introduced  +, Illustrated  +
Bastardia viscosa +
Illustrated  +
Batesimalva +
Conservation concern  +
Batesimalva violacea +
Conservation concern  +, Illustrated  +
Batis maritima +
Illustrated  +
Bebbia juncea +
Illustrated  +
Bebbia juncea var. aspera +
Illustrated  +
Begonia +
Introduced  +
Begonia cucullata +
Illustrated  +, Introduced  +
Begonia hirtella +
Introduced  +
Bejaria racemosa +
Illustrated  +, Endemic  +
Belamcanda chinensis +
Introduced  +, Illustrated  +
Bellardia +
Introduced  +
Bellardia latifolia +
Introduced  +
Bellardia trixago +
Introduced  +, Illustrated  +
Bellardia viscosa +
Introduced  +
Bellis perennis +
Introduced  +, Illustrated  +
Beloglottis costaricensis +
Illustrated  +
Benitoa occidentalis +
Illustrated  +, Endemic  +
Bensoniella oregona +
Illustrated  +, Endemic  +
Berberis amplectens +
Conservation concern  +, Endemic  +
Berberis aquifolium +
Endemic  +, Illustrated  +
Berberis bealei +
Introduced  +
Berberis canadensis +
Endemic  +
Berberis darwinii +
Introduced  +
Berberis dictyota +
Endemic  +, Illustrated  +
Berberis fendleri +
Endemic  +, Illustrated  +
Berberis fremontii +
Endemic  +, Illustrated  +
Berberis haematocarpa +
Illustrated  +
Berberis harrisoniana +
Conservation concern  +, Endemic  +
Berberis higginsiae +
Conservation concern  +
Berberis nervosa +
Endemic  +, Illustrated  +
Berberis nevinii +
Conservation concern  +, Endemic  +
Berberis pinnata subsp. insularis +
Conservation concern  +, Endemic  +
Berberis piperiana +
Endemic  +, Illustrated  +
Berberis pumila +
Endemic  +
Berberis repens +
Endemic  +, Illustrated  +
Berberis swaseyi +
Endemic  +
Berberis thunbergii +
W2  +, Introduced  +
Berberis trifoliolata +
Illustrated  +
Berberis vulgaris +
W2  +, Introduced  +
Berchemia scandens +
Illustrated  +
Bergerocactus emoryi +
Illustrated  +
Bergia texana +
Illustrated  +
Berlandiera pumila +
Illustrated  +, Endemic  +
Berlandiera subacaulis +
Endemic  +
Berlandiera texana +
Endemic  +
Bernardia obovata +
Illustrated  +
Berteroa incana +
Weedy  +, Introduced  +, Illustrated  +
Bestia +
Endemic  +
Bestia longipes +
Endemic  +, Illustrated  +
Beta vulgaris +
Introduced  +, Illustrated  +
Beta vulgaris subsp. maritima +
Introduced  +
Beta vulgaris subsp. vulgaris +
Introduced  +, Illustrated  +
Betula alleghaniensis +
Endemic  +, Illustrated  +
Betula cordifolia +
Endemic  +
Betula glandulosa +
Endemic  +, Illustrated  +
Betula kenaica +
Endemic  +
Betula lenta +
Endemic  +
Betula michauxii +
Endemic  +
Betula minor +
Endemic  +
Betula murrayana +
Conservation concern  +, Endemic  +
Betula neoalaskana +
Endemic  +
Betula nigra +
W1  +, Endemic  +, Illustrated  +
Betula occidentalis +
Endemic  +, Illustrated  +
Betula papyrifera +
Endemic  +, Illustrated  +
Betula populifolia +
W1  +, Endemic  +, Illustrated  +
Betula pubescens subsp. pubescens +
Introduced  +
Betula pumila +
Endemic  +
Betula uber +
Conservation concern  +, Endemic  +
Bidens amplissima +
Endemic  +, Conservation concern  +
Bidens aristosa +
Illustrated  +, Endemic  +
Bidens beckii +
Endemic  +
Bidens bidentoides +
Endemic  +
Bidens bipinnata +
Introduced  +, Illustrated  +
Bidens cernua +
Illustrated  +
Bidens discoidea +
Endemic  +
Bidens eatonii +
Endemic  +
Bidens frondosa +
Illustrated  +
Bidens heterodoxa +
Endemic  +
Bidens hyperborea +
Endemic  +
Bidens mitis +
Endemic  +
Bidens polylepis +
Endemic  +
Bidens trichosperma +
Endemic  +
Bidens vulgata +
Endemic  +
Bigelowia nudata +
Endemic  +
Bigelowia nudata var. australis +
Endemic  +
Bigelowia nudata var. nudata +
Endemic  +
Bigelowia nuttallii +
Illustrated  +, Endemic  +
Billieturnera helleri +
Illustrated  +
Bischofia +
Introduced  +
Bischofia javanica +
Introduced  +, Illustrated  +
Bistorta bistortoides +
Endemic  +
Bistorta officinalis +
Introduced  +
Bistorta vivipara +
Illustrated  +
Blennosperma bakeri +
Endemic  +, Conservation concern  +
Blennosperma nanum +
Illustrated  +, Endemic  +
Blennosperma nanum var. nanum +
Illustrated  +, Endemic  +
Blennosperma nanum var. robustum +
Endemic  +, Conservation concern  +
Blepharidachne kingii +
Endemic  +
Blepharipappus scaber +
Illustrated  +, Endemic  +
Blepharizonia laxa +
Endemic  +
Blepharizonia plumosa +
Illustrated  +, Endemic  +, Conservation concern  +
Bletia purpurea +
Illustrated  +
Bloomeria clevelandii +
Illustrated  +, Conservation concern  +
Bloomeria crocea +
Illustrated  +
Bloomeria crocea var. aurea +
Endemic  +
Bloomeria crocea var. crocea +
Illustrated  +
Bloomeria crocea var. montana +
Endemic  +
Bloomeria humilis +
Endemic  +, Conservation concern  +
Blutaparon vermiculare +
Illustrated  +
Blysmopsis rufa +
Illustrated  +
Blyxa aubertii +
Introduced  +, Illustrated  +
Boehmeria cylindrica +
Illustrated  +
Boehmeria nivea +
Introduced  +
Boerhavia coccinea +
Illustrated  +
Boerhavia coulteri +
Weedy  +, Illustrated  +
Boerhavia coulteri var. coulteri +
Illustrated  +
Boerhavia coulteri var. palmeri +
Weedy  +, Illustrated  +
Boerhavia diffusa +
Weedy  +, Illustrated  +
Boerhavia erecta +
Illustrated  +
Boerhavia intermedia +
Illustrated  +
Boerhavia megaptera +
Endemic  +
Boerhavia spicata +
Illustrated  +
Boerhavia torreyana +
Illustrated  +
Bolandra californica +
Endemic  +
Bolandra oregana +
Illustrated  +, Endemic  +
Bolboschoenus fluviatilis +
Illustrated  +
Bolboschoenus glaucus +
Introduced  +, Illustrated  +
Bolboschoenus maritimus +
Illustrated  +
Bolboschoenus maritimus subsp. maritimus +
Illustrated  +
Bolboschoenus maritimus subsp. paludosus +
Illustrated  +
Bolboschoenus novae-angliae +
Illustrated  +, Endemic  +
Bolboschoenus robustus +
Illustrated  +
Boltonia apalachicolensis +
Illustrated  +, Endemic  +
Boltonia asteroides +
Illustrated  +, Endemic  +
Boltonia asteroides var. asteroides +
Illustrated  +, Endemic  +
Boltonia asteroides var. latisquama +
Endemic  +
Boltonia asteroides var. recognita +
Endemic  +
Boltonia caroliniana +
Endemic  +
Boltonia decurrens +
Endemic  +, Conservation concern  +
Boltonia diffusa +
Illustrated  +, Endemic  +
Boltonia diffusa var. diffusa +
Illustrated  +, Endemic  +
Boltonia diffusa var. interior +
Endemic  +
Bommeria hispida +
Illustrated  +
Bontia daphnoides +
Illustrated  +
Borrichia frutescens +
Illustrated  +
Boschniakia rossica +
Illustrated  +
Bothriochloa bladhii +
Introduced  +
Bothriochloa ischaemum +
Introduced  +
Bothriochloa pertusa +
Introduced  +
Botrychium ascendens +
Endemic  +
Botrychium biternatum +
Endemic  +
Botrychium boreale +
Endemic  +
Botrychium campestre +
Illustrated  +, Endemic  +, Conservation concern  +
Botrychium crenulatum +
Endemic  +
Botrychium echo +
Endemic  +, Conservation concern  +
Botrychium hesperium +
Endemic  +
Botrychium lanceolatum +
Illustrated  +
Botrychium lanceolatum subsp. angustisegmentum +
Endemic  +
Botrychium lanceolatum subsp. lanceolatum +
Illustrated  +
Botrychium lunaria +
Illustrated  +
Botrychium lunarioides +
Endemic  +
Botrychium matricariifolium +
Illustrated  +
Botrychium minganense +
Illustrated  +, Endemic  +
Botrychium montanum +
Endemic  +
Botrychium mormo +
Endemic  +, Conservation concern  +
Botrychium paradoxum +
Illustrated  +, Endemic  +, Conservation concern  +
Botrychium pedunculosum +
Illustrated  +, Endemic  +, Conservation concern  +
Botrychium pinnatum +
Endemic  +
Botrychium pumicola +
Endemic  +, Conservation concern  +
Botrychium rugulosum +
Endemic  +
Botrychium simplex +
Illustrated  +
Botrychium spathulatum +
Endemic  +
Botrychium virginianum +
Illustrated  +
Bouteloua kayi +
Endemic  +
Boykinia aconitifolia +
Endemic  +
Boykinia major +
Endemic  +
Boykinia occidentalis +
Illustrated  +, Endemic  +
Boykinia richardsonii +
Endemic  +
Brachelyma +
Endemic  +
Brachelyma subulatum +
Endemic  +, Illustrated  +
Brachychiton +
Introduced  +
Brachychiton populneus +
Illustrated  +, Introduced  +
Brachyelytrum erectum +
Endemic  +
Brachymenium macrocarpum +
Illustrated  +
Brachypodium distachyon +
Introduced  +
Brachypodium pinnatum +
Introduced  +
Brachypodium sylvaticum +
Introduced  +
Brachystigma wrightii +
Illustrated  +
Brachytheciastrum collinum +
Illustrated  +
Brachytheciastrum delicatulum +
Endemic  +
Brachytheciastrum fendleri +
Illustrated  +
Brachytheciastrum leibergii +
Endemic  +, Illustrated  +
Brachytheciastrum velutinum +
Illustrated  +
Brachytheciastrum velutinum var. salicinum +
Illustrated  +
Brachytheciastrum velutinum var. velutinum +
Illustrated  +
Brachythecium acuminatum +
Endemic  +
Brachythecium acutum +
Endemic  +
Brachythecium asperrimum +
Endemic  +
Brachythecium bolanderi +
Endemic  +
Brachythecium brandegeei +
Endemic  +
Brachythecium cirrosum +
Illustrated  +
Brachythecium erythrorrhizon var. alpinum +
Endemic  +
Brachythecium rotaeanum +
Illustrated  +
Brachythecium rutabulum +
Illustrated  +
Bradburia hirtella +
Endemic  +
Bradburia pilosa +
Illustrated  +, Endemic  +
Brandegea bigelovii +
Illustrated  +
Brasenia schreberi +
W2  +, Illustrated  +
Brassia caudata +
Illustrated  +
Brassica elongata +
Introduced  +
Brassica fruticulosa +
Weedy  +, Introduced  +
Brassica juncea +
Weedy  +, Introduced  +
Brassica napus +
Introduced  +
Brassica nigra +
Weedy  +, Introduced  +
Brassica oleracea +
Introduced  +
Brassica rapa +
Weedy  +, Introduced  +
Brassica tournefortii +
Weedy  +, Introduced  +, Illustrated  +
Braunia andrieuxii +
Illustrated  +
Braya fernaldii +
Endemic  +, Conservation concern  +
Braya glabella +
Illustrated  +
Braya glabella subsp. glabella +
Illustrated  +
Braya glabella subsp. prostrata +
Illustrated  +
Braya glabella subsp. purpurascens +
Illustrated  +
Braya humilis +
Illustrated  +
Braya humilis subsp. ellesmerensis +
Illustrated  +
Braya humilis subsp. humilis +
Illustrated  +
Braya humilis subsp. maccallae +
Illustrated  +
Braya humilis subsp. porsildii +
Illustrated  +
Braya longii +
Endemic  +, Conservation concern  +
Braya pilosa +
Endemic  +, Conservation concern  +
Braya thorild-wulffii +
Endemic  +
Braya thorild-wulffii subsp. glabrata +
Endemic  +
Braya thorild-wulffii subsp. thorild-wulffii +
Endemic  +
Breynia +
Introduced  +
Breynia disticha +
Introduced  +, Illustrated  +
Brickellia baccharidea +
Endemic  +, Conservation concern  +
Brickellia brachyphylla +
Endemic  +
Brickellia chenopodina +
Endemic  +, Conservation concern  +
Brickellia cordifolia +
Endemic  +, Conservation concern  +
Brickellia cylindracea +
Endemic  +
Brickellia dentata +
Endemic  +
Brickellia eupatorioides +
Illustrated  +
Brickellia eupatorioides var. chlorolepis +
Illustrated  +
Brickellia eupatorioides var. corymbulosa +
Endemic  +
Brickellia eupatorioides var. eupatorioides +
Endemic  +
Brickellia eupatorioides var. floridana +
Endemic  +, Conservation concern  +
Brickellia eupatorioides var. gracillima +
Endemic  +
Brickellia eupatorioides var. texana +
Endemic  +
Brickellia grandiflora +
Illustrated  +, Endemic  +
Brickellia greenei +
Endemic  +
Brickellia hinckleyi +
Endemic  +, Conservation concern  +
Brickellia hinckleyi var. hinckleyi +
Endemic  +, Conservation concern  +
Brickellia hinckleyi var. terlinguensis +
Endemic  +, Conservation concern  +
Brickellia incana +
Endemic  +
Brickellia knappiana +
Endemic  +, Conservation concern  +
Brickellia longifolia +
Endemic  +
Brickellia longifolia var. longifolia +
Endemic  +
Brickellia longifolia var. multiflora +
Endemic  +
Brickellia microphylla +
Illustrated  +
Brickellia microphylla var. microphylla +
Illustrated  +
Brickellia microphylla var. scabra +
Illustrated  +
Brickellia nevinii +
Endemic  +
Brickellia oblongifolia +
Illustrated  +, Endemic  +
Brickellia oblongifolia var. linifolia +
Endemic  +
Brickellia oblongifolia var. oblongifolia +
Illustrated  +, Endemic  +
Brickellia parvula +
Endemic  +
Brickellia rusbyi +
Illustrated  +
Brickelliastrum fendleri +
Illustrated  +
Brintonia discoidea +
Illustrated  +, Endemic  +
Briza maxima +
Introduced  +
Briza media +
Introduced  +
Briza minor +
Introduced  +
Brodiaea appendiculata +
Endemic  +
Brodiaea californica +
Illustrated  +, Endemic  +
Brodiaea californica subsp. californica +
Illustrated  +, Endemic  +
Brodiaea californica subsp. leptandra +
Endemic  +
Brodiaea coronaria +
Illustrated  +, Endemic  +
Brodiaea coronaria subsp. coronaria +
Endemic  +
Brodiaea coronaria subsp. rosea +
Illustrated  +, Endemic  +
Brodiaea elegans +
Endemic  +
Brodiaea elegans subsp. elegans +
Endemic  +
Brodiaea elegans subsp. hooveri +
Endemic  +
Brodiaea filifolia +
Endemic  +, Conservation concern  +
Brodiaea insignis +
Endemic  +, Conservation concern  +
Brodiaea kinkiensis +
Endemic  +, Conservation concern  +
Brodiaea minor +
Endemic  +
Brodiaea orcuttii +
Illustrated  +, Endemic  +
Brodiaea pallida +
Endemic  +, Conservation concern  +
Brodiaea purdyi +
Endemic  +
Brodiaea stellaris +
Illustrated  +, Endemic  +
Brodiaea terrestris +
Illustrated  +, Endemic  +
Brodiaea terrestris subsp. kernensis +
Endemic  +
Brodiaea terrestris subsp. terrestris +
Illustrated  +, Endemic  +
Bromus aleutensis +
Endemic  +
Bromus arenarius +
Introduced  +
Bromus arvensis +
Introduced  +
Bromus briziformis +
Introduced  +
Bromus carinatus var. carinatus +
Endemic  +
Bromus catharticus +
Introduced  +
Bromus catharticus var. catharticus +
Introduced  +
Bromus catharticus var. elatus +
Introduced  +
Bromus commutatus +
Introduced  +
Bromus diandrus +
Introduced  +
Bromus erectus +
Introduced  +
Bromus hordeaceus +
Introduced  +
Bromus hordeaceus subsp. hordeaceus +
Introduced  +
Bromus hordeaceus subsp. molliformis +
Introduced  +
Bromus hordeaceus subsp. pseudothominei +
Introduced  +
Bromus hordeaceus subsp. thominei +
Introduced  +
Bromus inermis +
Introduced  +
Bromus japonicus +
Introduced  +
Bromus kalmii +
Endemic  +
Bromus laevipes +
Endemic  +
Bromus latiglumis +
Endemic  +
Bromus madritensis +
Introduced  +
Bromus maritimus +
Endemic  +
Bromus nottowayanus +
Endemic  +
Bromus orcuttianus +
Endemic  +
Bromus pacificus +
Endemic  +
Bromus polyanthus +
Endemic  +
Bromus pseudolaevipes +
Endemic  +
Bromus pubescens +
Endemic  +
Bromus pumpellianus subsp. dicksonii +
Endemic  +
Bromus racemosus +
Introduced  +
Bromus ramosus +
Introduced  +
Bromus rubens +
Introduced  +
Bromus scoparius +
Introduced  +
Bromus secalinus +
Introduced  +
Bromus sitchensis +
Endemic  +
Bromus squarrosus +
Introduced  +
Bromus sterilis +
Introduced  +
Bromus suksdorfii +
Endemic  +
Bromus tectorum +
Introduced  +
Bromus vulgaris +
Endemic  +
Brosimum alicastrum +
Illustrated  +, Introduced  +
Brotherella canadensis +
Endemic  +, Illustrated  +
Brotherella recurvans +
Endemic  +
Brotherella roellii +
Endemic  +
Broussonetia papyrifera +
W1  +, Illustrated  +, Introduced  +
Brunnichia ovata +
Weedy  +, Illustrated  +, Endemic  +
Bryhnia graminicolor +
Endemic  +, Illustrated  +
Bryhnia hultenii +
Illustrated  +
Bryhnia novae-angliae +
Illustrated  +
Bryoandersonia +
Endemic  +
Bryoandersonia illecebra +
Endemic  +, Illustrated  +
Bryocrumia vivicolor +
Illustrated  +
Bryolawtonia +
Endemic  +
Bryolawtonia vancouveriensis +
Endemic  +, Illustrated  +
Bryonia +
Introduced  +
Bryonia alba +
Illustrated  +, Introduced  +
Bryonia dioica +
Introduced  +
Bryum argenteum +
Illustrated  +
Bryum argenteum var. argenteum +
Illustrated  +
Bryum argenteum var. majus +
Illustrated  +
Bryum argenteum var. muticum +
Illustrated  +
Bryum calobryoides +
Endemic  +
Bryum chryseum +
Illustrated  +
Bryum veronense +
Illustrated  +
Buchnera americana +
Endemic  +
Buchnera floridana +
Illustrated  +
Buckiella undulata +
Illustrated  +
Buckleya distichophylla +
Illustrated  +, Endemic  +
Buddleja davidii +
Weedy  +, Introduced  +
Buddleja indica +
Introduced  +
Buddleja lindleyana +
Introduced  +
Buddleja madagascariensis +
Introduced  +
Buddleja marrubiifolia +
Illustrated  +
Buddleja racemosa +
Endemic  +
Buddleja racemosa var. incana +
Endemic  +
Buddleja racemosa var. racemosa +
Endemic  +
Buddleja saligna +
Introduced  +
Buddleja scordioides +
Illustrated  +
Buddleja utahensis +
Endemic  +
Bulbophyllum pachyrachis +
Illustrated  +
Bulbostylis barbata +
Illustrated  +
Bulbostylis capillaris +
Illustrated  +
Bulbostylis ciliatifolia +
Illustrated  +
Bulbostylis ciliatifolia var. ciliatifolia +
Illustrated  +, Endemic  +
Bulbostylis ciliatifolia var. coarctata +
Illustrated  +
Bulbostylis funckii +
Illustrated  +
Bulbostylis juncoides +
Illustrated  +
Bulbostylis schaffneri +
Illustrated  +
Bulbostylis stenophylla +
Illustrated  +
Bulbostylis warei +
Illustrated  +, Endemic  +
Bunias erucago +
Weedy  +, Introduced  +, Illustrated  +
Bunias orientalis +
Weedy  +, Introduced  +
Burmannia biflora +
Illustrated  +
Burmannia capitata +
Illustrated  +
Butomus umbellatus +
Weedy  +, Introduced  +, Illustrated  +
Byrsonima lucida +
Illustrated  +
C
Cabomba caroliniana +
W1  +, Illustrated  +
Cacaliopsis nardosmia +
Illustrated  +, Endemic  +
Cakile constricta +
Endemic  +
Cakile edentula +
Illustrated  +, Endemic  +
Cakile edentula subsp. edentula +
Illustrated  +, Endemic  +
Cakile edentula subsp. harperi +
Endemic  +
Cakile edentula var. edentula +
Illustrated  +, Endemic  +
Cakile edentula var. lacustris +
Endemic  +
Cakile maritima +
Weedy  +, Introduced  +
Cakile maritima subsp. maritima +
Weedy  +, Introduced  +
Calamagrostis bolanderi +
Endemic  +
Calamagrostis breweri +
Endemic  +
Calamagrostis cainii +
Endemic  +
Calamagrostis cinnoides +
Endemic  +
Calamagrostis foliosa +
Endemic  +
Calamagrostis howellii +
Endemic  +
Calamagrostis koelerioides +
Endemic  +
Calamagrostis montanensis +
Endemic  +
Calamagrostis ophitidis +
Endemic  +
Calamagrostis perplexa +
Endemic  +
Calamagrostis pickeringii +
Endemic  +
Calamagrostis porteri +
Endemic  +
Calamagrostis porteri subsp. insperata +
Endemic  +
Calamagrostis porteri subsp. porteri +
Endemic  +
Calamagrostis rubescens +
Endemic  +
Calamagrostis scopulorum +
Endemic  +
Calamagrostis tweedyi +
Endemic  +
Calamovilfa arcuata +
Endemic  +
Calamovilfa brevipilis +
Endemic  +
Calamovilfa curtissii +
Endemic  +
Calamovilfa gigantea +
Endemic  +
Calamovilfa longifolia +
Endemic  +
Calamovilfa longifolia var. longifolia +
Endemic  +
Calamovilfa longifolia var. magna +
Endemic  +
Calandrinia breweri +
Illustrated  +
Calandrinia ciliata +
Weedy  +
Calendula arvensis +
Introduced  +
Calendula officinalis +
Introduced  +, Illustrated  +
Calepina irregularis +
Introduced  +, Illustrated  +
Calla palustris +
Illustrated  +
Callaeum septentrionale +
Illustrated  +
Callicladium haldanianum +
Illustrated  +
Callicostella pallida +
Illustrated  +
Calliergon cordifolium +
Illustrated  +
Calliergon giganteum +
Illustrated  +
Calliergon orbicularicordatum +
Endemic  +
Calliergonella cuspidata +
Illustrated  +
Callirhoë alcaeoides +
Endemic  +, Weedy  +
Callirhoë bushii +
Endemic  +
Callirhoë digitata +
Endemic  +
Callirhoë involucrata +
Illustrated  +, Weedy  +
Callirhoë involucrata var. involucrata +
Illustrated  +, Weedy  +
Callirhoë involucrata var. lineariloba +
Endemic  +
Callirhoë leiocarpa +
Endemic  +, Illustrated  +
Callirhoë papaver +
Endemic  +
Callirhoë pedata +
Endemic  +
Callirhoë scabriuscula +
Conservation concern  +, Endemic  +
Callirhoë triangulata +
Endemic  +
Callisia cordifolia +
Illustrated  +
Callisia fragrans +
Introduced  +
Callisia graminea +
Illustrated  +, Endemic  +
Callisia micrantha +
Illustrated  +
Callisia ornata +
Endemic  +
Callisia repens +
Introduced  +, Illustrated  +
Callisia rosea +
Endemic  +
Callitriche fassettii +
Endemic  +, Conservation concern  +
Callitriche hermaphroditica +
Illustrated  +
Callitriche heterophylla +
Illustrated  +
Callitriche longipedunculata +
Endemic  +, Conservation concern  +
Callitriche pedunculosa +
Endemic  +
Callitriche peploides +
Endemic  +
Callitriche stagnalis +
Weedy  +, Introduced  +
Callitriche stenoptera +
Endemic  +
Callitriche trochlearis +
Endemic  +, Conservation concern  +
Callitris glaucophylla +
Introduced  +, Illustrated  +
Calluna vulgaris +
Introduced  +, Illustrated  +
Calocedrus decurrens +
Illustrated  +
Calochortus albus +
Illustrated  +, Endemic  +
Calochortus amabilis +
Endemic  +
Calochortus ambiguus +
Endemic  +
Calochortus amoenus +
Endemic  +
Calochortus apiculatus +
Illustrated  +, Endemic  +
Calochortus argillosus +
Illustrated  +, Endemic  +
Calochortus aureus +
Endemic  +
Calochortus bruneaunis +
Endemic  +
Calochortus catalinae +
Illustrated  +, Endemic  +
Calochortus clavatus +
Illustrated  +, Endemic  +
Calochortus clavatus var. avius +
Endemic  +
Calochortus clavatus var. clavatus +
Illustrated  +, Endemic  +
Calochortus clavatus var. gracilis +
Endemic  +
Calochortus clavatus var. pallidus +
Endemic  +
Calochortus clavatus var. recurvifolius +
Illustrated  +, Endemic  +
Calochortus coeruleus +
Endemic  +
Calochortus dunnii +
Illustrated  +, Conservation concern  +
Calochortus elegans +
Illustrated  +, Endemic  +
Calochortus elegans var. elegans +
Endemic  +
Calochortus elegans var. nanus +
Illustrated  +, Endemic  +
Calochortus elegans var. selwayensis +
Endemic  +
Calochortus eurycarpus +
Endemic  +
Calochortus excavatus +
Endemic  +
Calochortus flexuosus +
Illustrated  +, Endemic  +
Calochortus greenei +
Illustrated  +, Endemic  +, Conservation concern  +
Calochortus gunnisonii +
Illustrated  +, Endemic  +
Calochortus gunnisonii var. gunnisonii +
Illustrated  +, Endemic  +
Calochortus gunnisonii var. perpulcher +
Endemic  +
Calochortus howellii +
Illustrated  +, Endemic  +
Calochortus indecorus +
Endemic  +
Calochortus invenustus +
Endemic  +
Calochortus kennedyi +
Illustrated  +
Calochortus kennedyi var. kennedyi +
Illustrated  +
Calochortus kennedyi var. munzii +
Illustrated  +
Calochortus leichtlinii +
Illustrated  +, Endemic  +
Calochortus longebarbatus +
Illustrated  +, Endemic  +
Calochortus longebarbatus var. longebarbatus +
Illustrated  +, Endemic  +
Calochortus longebarbatus var. peckii +
Endemic  +
Calochortus luteus +
Illustrated  +, Endemic  +
Calochortus lyallii +
Illustrated  +, Endemic  +
Calochortus macrocarpus +
Illustrated  +, Endemic  +
Calochortus macrocarpus var. macrocarpus +
Illustrated  +, Endemic  +
Calochortus macrocarpus var. maculosus +
Endemic  +, Conservation concern  +
Calochortus minimus +
Endemic  +
Calochortus monanthus +
Endemic  +
Calochortus monophyllus +
Illustrated  +, Endemic  +
Calochortus nitidus +
Illustrated  +, Endemic  +
Calochortus nudus +
Illustrated  +, Endemic  +
Calochortus nuttallii +
Illustrated  +, Endemic  +
Calochortus obispoensis +
Illustrated  +, Endemic  +, Conservation concern  +
Calochortus palmeri +
Illustrated  +, Endemic  +, Conservation concern  +
Calochortus palmeri var. munzii +
Endemic  +, Conservation concern  +
Calochortus palmeri var. palmeri +
Illustrated  +, Endemic  +, Conservation concern  +
Calochortus panamintensis +
Endemic  +
Calochortus persistens +
Illustrated  +, Endemic  +, Conservation concern  +
Calochortus plummerae +
Illustrated  +, Endemic  +
Calochortus pulchellus +
Illustrated  +, Endemic  +, Conservation concern  +
Calochortus raichei +
Illustrated  +, Endemic  +, Conservation concern  +
Calochortus simulans +
Endemic  +
Calochortus striatus +
Illustrated  +, Endemic  +, Conservation concern  +
Calochortus subalpinus +
Illustrated  +, Endemic  +
Calochortus superbus +
Illustrated  +, Endemic  +
Calochortus tiburonensis +
Illustrated  +, Endemic  +, Conservation concern  +
Calochortus tolmiei +
Endemic  +
Calochortus umbellatus +
Endemic  +
Calochortus umpquaensis +
Illustrated  +, Endemic  +, Conservation concern  +
Calochortus uniflorus +
Endemic  +
Calochortus venustus +
Illustrated  +, Endemic  +
Calochortus vestae +
Illustrated  +, Endemic  +
Calochortus weedii +
Illustrated  +
Calochortus weedii var. intermedius +
Endemic  +
Calochortus weedii var. vestus +
Illustrated  +, Endemic  +
Calochortus weedii var. weedii +
Illustrated  +
Calochortus westonii +
Illustrated  +, Endemic  +, Conservation concern  +
Calophyllum +
Introduced  +
Calophyllum inophyllum +
Illustrated  +, Introduced  +
Calopogon barbatus +
Endemic  +
Calopogon multiflorus +
Endemic  +
Calopogon pallidus +
Endemic  +
Calopogon tuberosus +
Illustrated  +
Calopogon tuberosus var. simpsonii +
Illustrated  +
Calopogon tuberosus var. tuberosus +
Illustrated  +
Caltha leptosepala +
Endemic  +, Illustrated  +
Caltha natans +
Illustrated  +
Calycadenia fremontii +
Endemic  +
Calycadenia hooveri +
Endemic  +
Calycadenia mollis +
Endemic  +
Calycadenia multiglandulosa +
Illustrated  +, Endemic  +
Calycadenia oppositifolia +
Endemic  +
Calycadenia pauciflora +
Endemic  +
Calycadenia spicata +
Endemic  +
Calycadenia truncata +
Illustrated  +, Endemic  +
Calycadenia villosa +
Endemic  +
Calycanthus floridus +
Illustrated  +, Endemic  +
Calycanthus floridus var. floridus +
Endemic  +, Illustrated  +
Calycanthus floridus var. glaucus +
Endemic  +
Calycanthus occidentalis +
Endemic  +, Illustrated  +
Calycocarpum lyonii +
Endemic  +, Illustrated  +
Calycoseris wrightii +
Illustrated  +
Calydorea coelestina +
Illustrated  +, Endemic  +, Conservation concern  +
Calypso bulbosa +
Illustrated  +
Calypso bulbosa var. americana +
Illustrated  +, Endemic  +
Calypso bulbosa var. occidentalis +
Endemic  +
Calyptocarpus vialis +
Illustrated  +
Camassia angusta +
Endemic  +
Camassia cusickii +
Endemic  +
Camassia howellii +
Endemic  +, Conservation concern  +
Camassia leichtlinii +
Endemic  +
Camassia leichtlinii subsp. leichtlinii +
Endemic  +
Camassia leichtlinii subsp. suksdorfii +
Endemic  +
Camassia quamash +
Endemic  +
Camassia quamash subsp. azurea +
Endemic  +
Camassia quamash subsp. breviflora +
Endemic  +
Camassia quamash subsp. intermedia +
Endemic  +
Camassia quamash subsp. linearis +
Endemic  +
Camassia quamash subsp. maxima +
Endemic  +
Camassia quamash subsp. quamash +
Endemic  +
Camassia quamash subsp. utahensis +
Endemic  +
Camassia quamash subsp. walpolei +
Endemic  +
Camassia scilloides +
Illustrated  +, Endemic  +
Camelina alyssum +
Introduced  +
Camelina microcarpa +
Weedy  +, Introduced  +, Illustrated  +
Camelina sativa +
Weedy  +, Introduced  +
Campyliadelphus chrysophyllus +
Illustrated  +
Campylium stellatum +
Illustrated  +
Campylocentrum pachyrrhizum +
Illustrated  +
Campyloneurum phyllitidis +
Illustrated  +
Campylophyllum hispidulum +
Illustrated  +
Canadanthus modestus +
Illustrated  +, Endemic  +
Canbya aurea +
Endemic  +
Canbya candida +
Conservation concern  +, Endemic  +, Illustrated  +
Canella winterana +
Illustrated  +
Canna flaccida +
Illustrated  +, Endemic  +
Canna indica +
Introduced  +
Cannabis sativa +
W1  +, Illustrated  +, Introduced  +
Canotia holacantha +
Illustrated  +
Caperonia +
Introduced  +
Caperonia castaneifolia +
Introduced  +
Caperonia palustris +
Weedy  +, Introduced  +, Illustrated  +
Capraria +
Introduced  +
Capraria biflora +
Introduced  +, Illustrated  +
Capraria mexicana +
Introduced  +
Capsella bursa-pastoris +
Weedy  +, Introduced  +, Illustrated  +
Cardamine angulata +
Endemic  +
Cardamine angustata +
Endemic  +
Cardamine bellidifolia +
Illustrated  +
Cardamine breweri +
Endemic  +
Cardamine bulbosa +
Endemic  +
Cardamine clematitis +
Endemic  +
Cardamine concatenata +
Endemic  +
Cardamine constancei +
Endemic  +
Cardamine cordifolia +
Illustrated  +, Endemic  +
Cardamine diphylla +
Endemic  +
Cardamine dissecta +
Illustrated  +, Endemic  +
Cardamine douglassii +
Endemic  +
Cardamine flagellifera +
Endemic  +
Cardamine flexuosa +
Introduced  +
Cardamine hirsuta +
Weedy  +, Introduced  +
Cardamine impatiens +
Introduced  +
Cardamine longii +
Illustrated  +, Endemic  +
Cardamine micranthera +
Endemic  +, Conservation concern  +
Cardamine nuttallii +
Endemic  +
Cardamine occidentalis +
Endemic  +
Cardamine oligosperma +
Weedy  +
Cardamine pachystigma +
Endemic  +
Cardamine parviflora +
Weedy  +, Illustrated  +
Cardamine pattersonii +
Endemic  +, Conservation concern  +
Cardamine penduliflora +
Illustrated  +, Endemic  +
Cardamine pensylvanica +
Weedy  +, Endemic  +
Cardamine pratensis +
Weedy  +
Cardamine rotundifolia +
Endemic  +
Cardamine rupicola +
Endemic  +
Cardionema ramosissimum +
Illustrated  +
Carduus acanthoides +
Introduced  +, Illustrated  +
Carduus acanthoides subsp. acanthoides +
Introduced  +, Illustrated  +
Carduus crispus +
Introduced  +
Carduus nutans +
Introduced  +
Carduus pycnocephalus +
Introduced  +
Carduus pycnocephalus subsp. pycnocephalus +
Introduced  +
Carduus tenuiflorus +
Introduced  +
Carex aboriginum +
Illustrated  +, Endemic  +, Conservation concern  +
Carex abrupta +
Illustrated  +, Endemic  +
Carex abscondita +
Illustrated  +, Endemic  +
Carex acutiformis +
Introduced  +, Illustrated  +
Carex adelostoma +
Illustrated  +
Carex adusta +
Illustrated  +, Endemic  +
Carex aestivalis +
Illustrated  +, Endemic  +
Carex aggregata +
Illustrated  +, Endemic  +
Carex alata +
Illustrated  +, Endemic  +
Carex albicans +
Illustrated  +
Carex albicans var. albicans +
Illustrated  +, Endemic  +
Carex albicans var. australis +
Illustrated  +
Carex albicans var. emmonsii +
Illustrated  +, Endemic  +
Carex albida +
Illustrated  +, Endemic  +, Conservation concern  +
Carex albolutescens +
W1  +, Illustrated  +, Endemic  +
Carex albonigra +
Illustrated  +, Endemic  +
Carex albursina +
Illustrated  +, Endemic  +
Carex alma +
Illustrated  +
Carex alopecoidea +
Illustrated  +, Endemic  +
Carex amphibola +
Illustrated  +, Endemic  +
Carex amplectens +
Illustrated  +, Endemic  +
Carex amplifolia +
Illustrated  +, Endemic  +
Carex angustata +
Illustrated  +, Endemic  +
Carex annectens +
Illustrated  +, Endemic  +
Carex anthoxanthea +
Illustrated  +
Carex aperta +
Illustrated  +, Endemic  +
Carex appalachica +
Illustrated  +, Endemic  +
Carex aquatilis +
W2  +, W1  +, Illustrated  +
Carex aquatilis var. aquatilis +
Illustrated  +
Carex aquatilis var. dives +
Illustrated  +, Endemic  +
Carex aquatilis var. minor +
Illustrated  +, Endemic  +
Carex aquatilis var. substricta +
Illustrated  +, Endemic  +
Carex arapahoensis +
Illustrated  +, Endemic  +, Conservation concern  +
Carex arcta +
Illustrated  +, Endemic  +
Carex arctata +
Illustrated  +, Endemic  +
Carex arctiformis +
Illustrated  +, Endemic  +
Carex arenaria +
Introduced  +, Illustrated  +
Carex argyrantha +
Illustrated  +, Endemic  +
Carex arkansana +
Illustrated  +, Endemic  +
Carex assiniboinensis +
Illustrated  +, Endemic  +
Carex atherodes +
W1  +, Illustrated  +
Carex athrostachya +
Illustrated  +
Carex atlantica +
Illustrated  +, Endemic  +
Carex atlantica subsp. atlantica +
Illustrated  +, Endemic  +
Carex atlantica subsp. capillacea +
Illustrated  +, Endemic  +
Carex atrata +
Illustrated  +
Carex atratiformis +
Illustrated  +, Endemic  +
Carex atrofusca +
Illustrated  +
Carex atrosquama +
Illustrated  +, Endemic  +
Carex aurea +
Illustrated  +, Endemic  +
Carex aureolensis +
Illustrated  +
Carex austrina +
Illustrated  +, Endemic  +
Carex austrocaroliniana +
Illustrated  +, Endemic  +
Carex backii +
Illustrated  +, Endemic  +
Carex baileyi +
Illustrated  +, Endemic  +
Carex baltzellii +
Illustrated  +, Endemic  +, Conservation concern  +
Carex barbarae +
Illustrated  +, Endemic  +
Carex barrattii +
Illustrated  +, Endemic  +
Carex basiantha +
Illustrated  +, Endemic  +
Carex bebbii +
Illustrated  +, Endemic  +
Carex bella +
Illustrated  +
Carex bicknellii +
Illustrated  +, Endemic  +
Carex bicolor +
Illustrated  +
Carex bigelowii +
Illustrated  +
Carex bigelowii subsp. bigelowii +
Illustrated  +
Carex bigelowii subsp. lugens +
Illustrated  +
Carex biltmoreana +
Illustrated  +, Endemic  +, Conservation concern  +
Carex blanda +
Illustrated  +, Endemic  +
Carex bolanderi +
Illustrated  +
Carex bonanzensis +
Illustrated  +
Carex brainerdii +
Illustrated  +, Endemic  +
Carex brevicaulis +
Illustrated  +, Endemic  +
Carex brevior +
Illustrated  +
Carex breweri +
Illustrated  +, Endemic  +
Carex bromoides +
Illustrated  +
Carex bromoides subsp. bromoides +
Illustrated  +
Carex bromoides subsp. montana +
Illustrated  +
Carex brunnescens +
Illustrated  +
Carex brunnescens subsp. brunnescens +
Illustrated  +, Endemic  +
Carex brunnescens subsp. sphaerostachya +
Illustrated  +
Carex bulbostylis +
Illustrated  +, Endemic  +
Carex bullata +
Illustrated  +, Endemic  +
Carex bushii +
Illustrated  +, Endemic  +
Carex buxbaumii +
Illustrated  +
Carex californica +
Illustrated  +, Endemic  +, Conservation concern  +
Carex canescens +
Illustrated  +
Carex canescens subsp. canescens +
Illustrated  +
Carex canescens subsp. disjuncta +
Illustrated  +, Endemic  +
Carex capillaris +
Illustrated  +
Carex capitata +
Illustrated  +
Carex careyana +
Illustrated  +, Endemic  +
Carex caroliniana +
Illustrated  +, Endemic  +
Carex caryophyllea +
Introduced  +, Illustrated  +
Carex castanea +
Illustrated  +, Endemic  +
Carex cephaloidea +
Illustrated  +, Endemic  +
Carex cephalophora +
W2  +, Illustrated  +, Endemic  +
Carex chalciolepis +
Illustrated  +, Endemic  +
Carex chapmanii +
Illustrated  +, Endemic  +
Carex cherokeensis +
W2  +, W1  +, Illustrated  +, …
Carex chihuahuensis +
Illustrated  +
Carex chordorrhiza +
Illustrated  +
Carex circinata +
Illustrated  +, Endemic  +
Carex collinsii +
Illustrated  +, Endemic  +
Carex communis +
Illustrated  +, Endemic  +
Carex communis var. amplisquama +
Illustrated  +, Endemic  +
Carex communis var. communis +
Illustrated  +, Endemic  +
Carex comosa +
W2  +, Illustrated  +
Carex complanata +
Illustrated  +
Carex concinna +
Illustrated  +, Endemic  +
Carex concinnoides +
Illustrated  +, Endemic  +
Carex congdonii +
Illustrated  +, Endemic  +
Carex conjuncta +
Illustrated  +, Endemic  +
Carex conoidea +
Illustrated  +, Endemic  +
Carex corrugata +
Illustrated  +, Endemic  +
Carex crawei +
Illustrated  +, Endemic  +
Carex crawfordii +
Illustrated  +, Endemic  +
Carex crebriflora +
Illustrated  +, Endemic  +
Carex crinita +
Illustrated  +, Endemic  +
Carex crinita var. brevicrinis +
Illustrated  +, Endemic  +
Carex crinita var. crinita +
Illustrated  +, Endemic  +
Carex cristatella +
Illustrated  +, Endemic  +
Carex crus-corvi +
Illustrated  +, Endemic  +
Carex cryptolepis +
Illustrated  +, Endemic  +
Carex cumulata +
Illustrated  +, Endemic  +
Carex curatorum +
Illustrated  +, Endemic  +, Conservation concern  +
Carex cusickii +
Illustrated  +, Endemic  +
Carex dasycarpa +
Illustrated  +, Endemic  +
Carex davisii +
Illustrated  +, Endemic  +
Carex davyi +
Illustrated  +, Endemic  +
Carex debilis +
Illustrated  +, Endemic  +
Carex debilis var. debilis +
Illustrated  +, Endemic  +
Carex debilis var. rudgei +
Illustrated  +, Endemic  +
Carex decomposita +
Illustrated  +, Endemic  +
Carex deflexa +
Illustrated  +, Endemic  +
Carex deflexa var. boottii +
Illustrated  +, Endemic  +
Carex deflexa var. deflexa +
Illustrated  +, Endemic  +
Carex densa +
Illustrated  +, Endemic  +
Carex deweyana +
Illustrated  +, Endemic  +
Carex deweyana var. collectanea +
Illustrated  +, Endemic  +
Carex deweyana var. deweyana +
Illustrated  +, Endemic  +
Carex diandra +
Illustrated  +
Carex digitalis +
Illustrated  +, Endemic  +
Carex digitalis var. digitalis +
Illustrated  +, Endemic  +
Carex digitalis var. floridana +
Illustrated  +, Endemic  +
Carex digitalis var. macropoda +
Illustrated  +, Endemic  +
Carex diluta +
Introduced  +, Illustrated  +
Carex disperma +
Illustrated  +
Carex distans +
Introduced  +, Illustrated  +
Carex disticha +
Introduced  +, Illustrated  +
Carex divisa +
Introduced  +, Illustrated  +
Carex divulsa +
Introduced  +, Illustrated  +
Carex divulsa subsp. divulsa +
Introduced  +, Illustrated  +
Carex douglasii +
Illustrated  +
Carex duriuscula +
Illustrated  +
Carex ebenea +
Illustrated  +, Endemic  +
Carex eburnea +
Illustrated  +
Carex echinata +
Illustrated  +
Carex echinata subsp. echinata +
Illustrated  +
Carex echinata subsp. phyllomanica +
Illustrated  +, Endemic  +
Carex edwardsiana +
Illustrated  +, Endemic  +
Carex egglestonii +
Illustrated  +, Endemic  +
Carex eleusinoides +
Illustrated  +
Carex elliottii +
Illustrated  +, Endemic  +
Carex elynoides +
Illustrated  +, Endemic  +
Carex emoryi +
Illustrated  +
Carex engelmannii +
Illustrated  +, Endemic  +
Carex epapillosa +
Illustrated  +, Endemic  +
Carex exilis +
Illustrated  +, Endemic  +
Carex exsiccata +
Illustrated  +, Endemic  +
Carex extensa +
Introduced  +, Illustrated  +
Carex festucacea +
Illustrated  +, Endemic  +
Carex feta +
Illustrated  +, Endemic  +
Carex filifolia +
Illustrated  +, Endemic  +
Carex filifolia var. erostrata +
Illustrated  +, Endemic  +
Carex filifolia var. filifolia +
Illustrated  +, Endemic  +
Carex fissa +
Illustrated  +, Endemic  +
Carex fissa var. aristata +
Illustrated  +, Endemic  +
Carex fissa var. fissa +
Illustrated  +, Endemic  +
Carex fissuricola +
Illustrated  +, Endemic  +
Carex flacca +
Introduced  +, Illustrated  +
Carex flaccosperma +
Illustrated  +, Endemic  +
Carex flava +
Illustrated  +
Carex floridana +
Illustrated  +, Endemic  +
Carex foenea +
Illustrated  +, Endemic  +
Carex folliculata +
Illustrated  +, Endemic  +
Carex formosa +
Illustrated  +, Endemic  +
Carex fracta +
Illustrated  +, Endemic  +
Carex frankii +
W1  +, Illustrated  +, Endemic  +
Carex fuliginosa +
Illustrated  +
Carex garberi +
Illustrated  +, Endemic  +
Carex geophila +
Illustrated  +
Carex geyeri +
Illustrated  +, Endemic  +
Carex gigantea +
Illustrated  +, Endemic  +
Carex glacialis +
Illustrated  +
Carex glareosa +
Illustrated  +
Carex glareosa subsp. glareosa +
Illustrated  +
Carex glareosa subsp. pribylovensis +
Illustrated  +, Endemic  +, Conservation concern  +
Carex glaucescens +
W1  +, Illustrated  +, Endemic  +
Carex glaucodea +
Illustrated  +, Endemic  +
Carex globosa +
Illustrated  +, Endemic  +
Carex gmelinii +
Illustrated  +
Carex godfreyi +
Illustrated  +, Endemic  +
Carex gracilescens +
Illustrated  +, Endemic  +
Carex gracilior +
Illustrated  +, Endemic  +
Carex gracillima +
Illustrated  +, Endemic  +
Carex granularis +
Illustrated  +, Endemic  +
Carex gravida +
Illustrated  +, Endemic  +
Carex grayi +
Illustrated  +, Endemic  +
Carex grisea +
Illustrated  +, Endemic  +
Carex gynandra +
Illustrated  +, Endemic  +
Carex gynocrates +
Illustrated  +
Carex gynodynama +
Illustrated  +, Endemic  +
Carex halliana +
Illustrated  +, Endemic  +
Carex hallii +
Illustrated  +, Endemic  +
Carex harfordii +
Illustrated  +, Endemic  +
Carex hassei +
Illustrated  +
Carex haydeniana +
Illustrated  +, Endemic  +
Carex haydenii +
Illustrated  +, Endemic  +
Carex heleonastes +
Illustrated  +
Carex helleri +
Illustrated  +, Endemic  +
Carex hendersonii +
Illustrated  +, Endemic  +
Carex heteroneura +
Illustrated  +, Endemic  +
Carex heterostachya +
Introduced  +, Illustrated  +
Carex hirsutella +
Illustrated  +, Endemic  +
Carex hirta +
Introduced  +, Illustrated  +
Carex hirtifolia +
Illustrated  +, Endemic  +
Carex hirtissima +
Illustrated  +, Endemic  +
Carex hitchcockiana +
Illustrated  +, Endemic  +
Carex holostoma +
Illustrated  +
Carex hoodii +
Illustrated  +, Endemic  +
Carex hookeriana +
Illustrated  +, Endemic  +
Carex hormathodes +
Illustrated  +, Endemic  +
Carex hostiana +
Illustrated  +
Carex houghtoniana +
Illustrated  +, Endemic  +
Carex hyalina +
Illustrated  +, Endemic  +
Carex hyalinolepis +
Illustrated  +, Endemic  +
Carex hystericina +
Illustrated  +, Endemic  +
Carex idahoa +
Illustrated  +, Endemic  +, Conservation concern  +
Carex illota +
Illustrated  +, Endemic  +
Carex incurviformis +
Illustrated  +, Endemic  +
Carex inops +
Illustrated  +, Endemic  +
Carex inops subsp. heliophila +
Illustrated  +, Endemic  +
Carex inops subsp. inops +
Illustrated  +, Endemic  +
Carex integra +
Illustrated  +, Endemic  +
Carex interior +
Illustrated  +
Carex interrupta +
Illustrated  +, Endemic  +
Carex intumescens +
Illustrated  +, Endemic  +
Carex jamesii +
Illustrated  +, Endemic  +
Carex jonesii +
Illustrated  +, Endemic  +
Carex joorii +
Illustrated  +, Endemic  +
Carex kobomugi +
Introduced  +, Illustrated  +
Carex krausei +
Illustrated  +
Carex lachenalii +
Illustrated  +
Carex lacustris +
W1  +, Illustrated  +, Endemic  +
Carex laeviconica +
Illustrated  +, Endemic  +
Carex laeviculmis +
Illustrated  +, Endemic  +
Carex laevivaginata +
Illustrated  +, Endemic  +
Carex lapponica +
Illustrated  +
Carex lasiocarpa +
W1  +, Illustrated  +
Carex laxiculmis +
Illustrated  +, Endemic  +
Carex laxiculmis var. copulata +
Illustrated  +, Endemic  +
Carex laxiculmis var. laxiculmis +
Illustrated  +, Endemic  +
Carex laxiflora +
Illustrated  +, Endemic  +
Carex leavenworthii +
Illustrated  +, Endemic  +
Carex lemmonii +
Illustrated  +, Endemic  +
Carex lenticularis +
Illustrated  +, Endemic  +
Carex lenticularis var. dolia +
Illustrated  +, Endemic  +
Carex lenticularis var. impressa +
Illustrated  +, Endemic  +
Carex lenticularis var. lenticularis +
Illustrated  +, Endemic  +
Carex lenticularis var. limnophila +
Illustrated  +, Endemic  +
Carex lenticularis var. lipocarpa +
Illustrated  +, Endemic  +
Carex leporinella +
Illustrated  +, Endemic  +
Carex leptalea +
Illustrated  +
Carex leptonervia +
Illustrated  +, Endemic  +
Carex leptopoda +
Illustrated  +, Endemic  +
Carex limosa +
Illustrated  +
Carex livida +
Illustrated  +
Carex loliacea +
Illustrated  +
Carex lonchocarpa +
Illustrated  +, Endemic  +
Carex longii +
Illustrated  +
Carex louisianica +
W1  +, Illustrated  +, Endemic  +
Carex lucorum +
Illustrated  +, Endemic  +
Carex lucorum var. austrolucorum +
Illustrated  +, Endemic  +
Carex lucorum var. lucorum +
Illustrated  +, Endemic  +
Carex lupuliformis +
Illustrated  +, Endemic  +
Carex lupulina +
W2  +, W1  +, Illustrated  +, …
Carex lurida +
Illustrated  +
Carex luzulifolia +
Illustrated  +, Endemic  +
Carex luzulina +
Illustrated  +, Endemic  +
Carex luzulina var. ablata +
Illustrated  +, Endemic  +
Carex luzulina var. luzulina +
Illustrated  +, Endemic  +
Carex lyngbyei +
Illustrated  +
Carex mackenziei +
Illustrated  +
Carex macloviana +
Illustrated  +
Carex macrocephala +
Illustrated  +
Carex macrochaeta +
Illustrated  +
Carex magellanica +
Illustrated  +
Carex magellanica subsp. irrigua +
Illustrated  +
Carex manhartii +
Illustrated  +, Endemic  +
Carex marina +
Illustrated  +
Carex mariposana +
Illustrated  +, Endemic  +
Carex maritima +
Illustrated  +
Carex meadii +
Illustrated  +
Carex media +
Illustrated  +
Carex melanostachya +
Introduced  +, Illustrated  +
Carex membranacea +
Illustrated  +
Carex mendocinensis +
Illustrated  +, Endemic  +
Carex merritt-fernaldii +
Illustrated  +, Endemic  +
Carex mertensii +
Illustrated  +
Carex mesochorea +
Illustrated  +, Endemic  +
Carex michauxiana +
Illustrated  +, Endemic  +
Carex microchaeta +
Illustrated  +
Carex microchaeta subsp. microchaeta +
Illustrated  +
Carex microchaeta subsp. nesophila +
Illustrated  +
Carex microdonta +
Illustrated  +, Endemic  +
Carex microglochin +
Illustrated  +
Carex microglochin subsp. microglochin +
Illustrated  +
Carex micropoda +
Illustrated  +
Carex microptera +
Illustrated  +
Carex misera +
Illustrated  +, Endemic  +
Carex mitchelliana +
Illustrated  +, Endemic  +
Carex molesta +
Illustrated  +, Endemic  +
Carex muehlenbergii +
Illustrated  +, Endemic  +
Carex muehlenbergii var. enervis +
Illustrated  +, Endemic  +
Carex muehlenbergii var. muehlenbergii +
Illustrated  +, Endemic  +
Carex multicaulis +
Illustrated  +, Endemic  +
Carex multicostata +
Illustrated  +, Endemic  +
Carex muricata +
Introduced  +, Illustrated  +
Carex muricata subsp. lamprocarpa +
Introduced  +, Illustrated  +
Carex muriculata +
Illustrated  +
Carex muskingumensis +
Illustrated  +, Endemic  +
Carex nardina +
Illustrated  +
Carex nebrascensis +
W2  +, W1  +, Illustrated  +, …
Carex nelsonii +
Illustrated  +, Endemic  +
Carex nervina +
Illustrated  +, Endemic  +
Carex neurophora +
Illustrated  +, Endemic  +
Carex nigra +
Illustrated  +
Carex nigricans +
Illustrated  +, Endemic  +
Carex nigromarginata +
Illustrated  +, Endemic  +
Carex normalis +
Illustrated  +, Endemic  +
Carex norvegica +
Illustrated  +
Carex nova +
Illustrated  +, Endemic  +
Carex novae-angliae +
Illustrated  +, Endemic  +
Carex nudata +
Illustrated  +, Endemic  +
Carex obispoensis +
Illustrated  +, Endemic  +, Conservation concern  +
Carex obnupta +
Illustrated  +, Endemic  +
Carex obtusata +
Illustrated  +
Carex occidentalis +
Illustrated  +, Endemic  +
Carex oklahomensis +
Illustrated  +, Endemic  +
Carex oligocarpa +
Illustrated  +, Endemic  +
Carex oligosperma +
Illustrated  +, Endemic  +
Carex opaca +
Illustrated  +, Endemic  +
Carex oreocharis +
Illustrated  +
Carex ormostachya +
Illustrated  +, Endemic  +
Carex oronensis +
Illustrated  +, Endemic  +, Conservation concern  +
Carex ovalis +
Illustrated  +
Carex oxylepis +
Illustrated  +, Endemic  +
Carex pachystachya +
Illustrated  +
Carex paleacea +
Illustrated  +
Carex pallescens +
W1  +, Illustrated  +
Carex panicea +
Illustrated  +
Carex pansa +
Illustrated  +, Endemic  +
Carex parallela +
Illustrated  +
Carex parallela subsp. parallela +
Illustrated  +
Carex parryana +
Illustrated  +, Endemic  +
Carex pauciflora +
Illustrated  +
Carex paysonis +
Illustrated  +, Endemic  +
Carex peckii +
Illustrated  +, Endemic  +
Carex pedunculata +
Illustrated  +
Carex pellita +
Illustrated  +
Carex pelocarpa +
Illustrated  +, Endemic  +
Carex pensylvanica +
Illustrated  +, Endemic  +
Carex perglobosa +
Illustrated  +, Endemic  +
Carex petasata +
Illustrated  +, Endemic  +
Carex petricosa +
Illustrated  +
Carex petricosa var. misandroides +
Illustrated  +, Endemic  +
Carex petricosa var. petricosa +
Illustrated  +
Carex phaeocephala +
Illustrated  +, Endemic  +
Carex picta +
Illustrated  +, Endemic  +
Carex planispicata +
Illustrated  +, Endemic  +
Carex planostachys +
Illustrated  +
Carex plantaginea +
Illustrated  +, Endemic  +
Carex platyphylla +
Illustrated  +, Endemic  +
Carex pluriflora +
Illustrated  +
Carex podocarpa +
Illustrated  +
Carex polymorpha +
Illustrated  +, Endemic  +, Conservation concern  +
Carex praeceptorum +
Illustrated  +, Endemic  +
Carex praegracilis +
Illustrated  +
Carex prairea +
Illustrated  +, Endemic  +
Carex prasina +
Illustrated  +, Endemic  +
Carex praticola +
Illustrated  +, Endemic  +
Carex preslii +
Illustrated  +, Endemic  +
Carex projecta +
Illustrated  +, Endemic  +
Carex proposita +
Illustrated  +, Endemic  +
Carex pseudocyperus +
Illustrated  +
Carex purpurifera +
Illustrated  +, Endemic  +
Carex radiata +
Illustrated  +, Endemic  +
Carex ramenskii +
Illustrated  +
Carex rariflora +
Illustrated  +
Carex raynoldsii +
Illustrated  +, Endemic  +
Carex recta +
Illustrated  +
Carex reniformis +
Illustrated  +, Endemic  +
Carex retroflexa +
Illustrated  +, Endemic  +
Carex retrorsa +
Illustrated  +, Endemic  +
Carex richardsonii +
Illustrated  +, Endemic  +
Carex roanensis +
Illustrated  +, Endemic  +, Conservation concern  +
Carex rosea +
Illustrated  +, Endemic  +
Carex rossii +
Illustrated  +, Endemic  +
Carex rostrata +
W1  +, Illustrated  +
Carex rotundata +
Illustrated  +
Carex rufina +
Illustrated  +
Carex rupestris +
Illustrated  +
Carex ruthii +
Illustrated  +, Endemic  +
Carex sabulosa +
Illustrated  +
Carex salina +
Illustrated  +
Carex sartwelliana +
Illustrated  +, Endemic  +
Carex sartwellii +
Illustrated  +, Endemic  +
Carex saxatilis +
Illustrated  +
Carex saximontana +
Illustrated  +, Endemic  +
Carex scabrata +
Illustrated  +, Endemic  +
Carex scabriuscula +
Illustrated  +, Endemic  +
Carex schottii +
Illustrated  +, Endemic  +
Carex schweinitzii +
Illustrated  +, Endemic  +
Carex scirpoidea +
Illustrated  +
Carex scirpoidea subsp. convoluta +
Illustrated  +, Endemic  +
Carex scirpoidea subsp. pseudoscirpoidea +
Illustrated  +, Endemic  +
Carex scirpoidea subsp. scirpoidea +
Illustrated  +
Carex scirpoidea subsp. stenochlaena +
Illustrated  +, Endemic  +
Carex scoparia +
Illustrated  +, Endemic  +
Carex scoparia var. scoparia +
Illustrated  +, Endemic  +
Carex scoparia var. tessellata +
Illustrated  +, Endemic  +
Carex scopulorum +
Illustrated  +, Endemic  +
Carex scopulorum var. bracteosa +
Illustrated  +, Endemic  +
Carex scopulorum var. prionophylla +
Illustrated  +, Endemic  +
Carex scopulorum var. scopulorum +
Illustrated  +, Endemic  +
Carex senta +
W1  +, Illustrated  +
Carex seorsa +
Illustrated  +, Endemic  +
Carex serratodens +
Illustrated  +, Endemic  +
Carex sheldonii +
Illustrated  +, Endemic  +
Carex shortiana +
Illustrated  +, Endemic  +
Carex siccata +
Illustrated  +, Endemic  +
Carex silicea +
Illustrated  +, Endemic  +
Carex simulata +
Illustrated  +, Endemic  +
Carex socialis +
Illustrated  +, Endemic  +
Carex sparganioides +
Illustrated  +, Endemic  +
Carex specifica +
Illustrated  +, Endemic  +
Carex spectabilis +
Illustrated  +, Endemic  +
Carex specuicola +
Illustrated  +, Endemic  +, Conservation concern  +
Carex spicata +
Introduced  +, Illustrated  +
Carex spissa +
Illustrated  +
Carex sprengelii +
Illustrated  +, Endemic  +
Carex squarrosa +
Illustrated  +, Endemic  +
Carex stenoptila +
Illustrated  +, Endemic  +
Carex sterilis +
Illustrated  +, Endemic  +
Carex stevenii +
Illustrated  +, Endemic  +
Carex stipata +
Illustrated  +
Carex stipata var. maxima +
Illustrated  +, Endemic  +
Carex stipata var. stipata +
Illustrated  +
Carex straminea +
Illustrated  +, Endemic  +
Carex straminiformis +
Illustrated  +, Endemic  +
Carex striata +
Illustrated  +, Endemic  +
Carex striatula +
Illustrated  +, Endemic  +
Carex stricta +
Illustrated  +, Endemic  +
Carex styloflexa +
Illustrated  +, Endemic  +
Carex stylosa +
Illustrated  +
Carex subbracteata +
Illustrated  +, Endemic  +
Carex suberecta +
Illustrated  +, Endemic  +
Carex subfusca +
Illustrated  +
Carex subnigricans +
Illustrated  +, Endemic  +
Carex subspathacea +
Illustrated  +
Carex superata +
Illustrated  +, Endemic  +
Carex supina +
Illustrated  +
Carex supina subsp. spaniocarpa +
Illustrated  +
Carex swanii +
Illustrated  +, Endemic  +
Carex sychnocephala +
Illustrated  +, Endemic  +
Carex sylvatica +
Introduced  +, Illustrated  +
Carex tahoensis +
Illustrated  +, Endemic  +
Carex tenax +
Illustrated  +, Endemic  +
Carex tenera +
Illustrated  +, Endemic  +
Carex tenera var. echinodes +
Illustrated  +, Endemic  +
Carex tenera var. tenera +
Illustrated  +, Endemic  +
Carex tenuiflora +
Illustrated  +
Carex tetanica +
Illustrated  +, Endemic  +
Carex tetrastachya +
Illustrated  +, Endemic  +
Carex texensis +
Illustrated  +, Endemic  +
Carex thurberi +
Illustrated  +
Carex tincta +
Illustrated  +, Endemic  +
Carex tompkinsii +
Illustrated  +, Endemic  +, Conservation concern  +
Carex tonsa +
Illustrated  +, Endemic  +
Carex tonsa var. rugosperma +
Illustrated  +, Endemic  +
Carex tonsa var. tonsa +
Illustrated  +, Endemic  +
Carex torreyi +
Illustrated  +, Endemic  +
Carex torta +
Illustrated  +, Endemic  +
Carex triangularis +
Illustrated  +, Endemic  +
Carex tribuloides +
Illustrated  +
Carex tribuloides var. sangamonensis +
Illustrated  +
Carex tribuloides var. tribuloides +
Illustrated  +, Endemic  +
Carex trichocarpa +
Illustrated  +, Endemic  +
Carex triquetra +
Illustrated  +, Conservation concern  +
Carex trisperma +
Illustrated  +, Endemic  +
Carex tuckermanii +
Illustrated  +, Endemic  +
Carex tumulicola +
Illustrated  +, Endemic  +
Carex turbinata +
Illustrated  +
Carex turgescens +
Illustrated  +, Endemic  +
Carex typhina +
Illustrated  +, Endemic  +
Carex umbellata +
Illustrated  +, Endemic  +
Carex unilateralis +
Illustrated  +, Endemic  +
Carex ursina +
Illustrated  +
Carex utriculata +
Illustrated  +
Carex vacillans +
Illustrated  +
Carex vaginata +
Illustrated  +
Carex vallicola +
Illustrated  +
Carex venusta +
Illustrated  +, Endemic  +
Carex vernacula +
Illustrated  +, Endemic  +
Carex verrucosa +
W1  +, Illustrated  +, Endemic  +
Carex vesicaria +
Illustrated  +
Carex vestita +
Illustrated  +, Endemic  +
Carex vexans +
Illustrated  +, Endemic  +
Carex virescens +
Illustrated  +, Endemic  +
Carex viridula +
Illustrated  +
Carex viridula subsp. brachyrrhyncha +
Illustrated  +
Carex viridula subsp. oedocarpa +
Illustrated  +
Carex viridula subsp. viridula +
Illustrated  +
Carex viridula var. elatior +
Illustrated  +
Carex viridula var. saxilittoralis +
Illustrated  +
Carex viridula var. viridula +
Illustrated  +
Carex vulpinoidea +
Illustrated  +
Carex whitneyi +
Illustrated  +, Endemic  +
Carex wiegandii +
Illustrated  +, Endemic  +
Carex willdenowii +
Illustrated  +, Endemic  +
Carex williamsii +
Illustrated  +
Carex woodii +
Illustrated  +, Endemic  +
Carex wootonii +
Illustrated  +
Carex xerantica +
Illustrated  +, Endemic  +
Carica papaya +
Introduced  +, Illustrated  +
Carlina vulgaris +
Introduced  +, Illustrated  +
Carlina vulgaris subsp. vulgaris +
Introduced  +, Illustrated  +
Carlquistia muirii +
Illustrated  +, Endemic  +, Conservation concern  +
Carminatia tenuiflora +
Illustrated  +
Carnegiea gigantea +
Illustrated  +
Carpenteria +
Endemic  +, Conservation concern  +
Carpenteria californica +
Illustrated  +, Endemic  +, Conservation concern  +
Carphephorus bellidifolius +
Endemic  +
Carphephorus carnosus +
Endemic  +
Carphephorus corymbosus +
Illustrated  +, Endemic  +
Carphephorus odoratissimus +
Endemic  +
Carphephorus odoratissimus var. odoratissimus +
Endemic  +
Carphephorus odoratissimus var. subtropicanus +
Endemic  +
Carphephorus paniculatus +
Illustrated  +, Endemic  +
Carphephorus pseudoliatris +
Endemic  +
Carphephorus tomentosus +
Endemic  +
Carphochaete bigelovii +
Illustrated  +
Carpinus caroliniana +
Illustrated  +, Endemic  +
Carpinus caroliniana subsp. caroliniana +
Endemic  +
Carpinus caroliniana subsp. virginiana +
Endemic  +, Illustrated  +
Carpobrotus chilensis +
Introduced  +
Carpobrotus edulis +
Introduced  +, Illustrated  +
Carthamus creticus +
Weedy  +, Introduced  +
Carthamus lanatus +
Weedy  +, Introduced  +, Illustrated  +
Carthamus leucocaulos +
Weedy  +, Introduced  +
Carthamus tinctorius +
Introduced  +
Carya aquatica +
Endemic  +, Illustrated  +
Carya cordiformis +
Endemic  +, Illustrated  +
Carya floridana +
Endemic  +
Carya glabra +
W1  +, Endemic  +
Carya laciniosa +
Endemic  +
Carya ovata +
Illustrated  +
Carya ovata var. australis +
Endemic  +
Carya ovata var. ovata +
Endemic  +, Illustrated  +
Carya pallida +
Endemic  +
Carya texana +
Endemic  +
Carya tomentosa +
Endemic  +, Illustrated  +
Caryota mitis +
Introduced  +, Illustrated  +
Caryota urens +
Introduced  +
Cassiope lycopodioides +
Endemic  +
Cassiope mertensiana +
Illustrated  +, Endemic  +
Cassiope mertensiana subsp. californica +
Illustrated  +, Endemic  +
Cassiope mertensiana subsp. ciliolata +
Illustrated  +, Endemic  +
Cassiope mertensiana subsp. gracilis +
Illustrated  +, Endemic  +
Cassiope mertensiana subsp. mertensiana +
Illustrated  +, Endemic  +
Cassiope tetragona subsp. saximontana +
Endemic  +
Cassytha filiformis +
Endemic  +, Illustrated  +
Castanea dentata +
Endemic  +
Castanea ozarkensis +
Endemic  +
Castanea pumila +
Endemic  +, Illustrated  +
Castilleja affinis +
Illustrated  +
Castilleja affinis var. affinis +
Illustrated  +
Castilleja affinis var. contentiosa +
Illustrated  +, Endemic  +
Castilleja affinis var. neglecta +
Illustrated  +, Endemic  +, Conservation concern  +
Castilleja ambigua +
Endemic  +
Castilleja ambigua var. ambigua +
Endemic  +
Castilleja ambigua var. humboldtiensis +
Endemic  +, Conservation concern  +
Castilleja ambigua var. insalutata +
Endemic  +, Conservation concern  +
Castilleja ambigua var. meadii +
Endemic  +, Conservation concern  +
Castilleja angustifolia +
Endemic  +
Castilleja angustifolia var. angustifolia +
Endemic  +
Castilleja angustifolia var. dubia +
Endemic  +
Castilleja angustifolia var. flavescens +
Endemic  +
Castilleja applegatei +
Illustrated  +, Endemic  +
Castilleja applegatei var. applegatei +
Endemic  +
Castilleja applegatei var. breweri +
Endemic  +
Castilleja applegatei var. pinetorum +
Illustrated  +, Endemic  +
Castilleja applegatei var. viscida +
Endemic  +
Castilleja aquariensis +
Endemic  +, Conservation concern  +
Castilleja arachnoidea +
Illustrated  +, Endemic  +
Castilleja attenuata +
Illustrated  +
Castilleja brevilobata +
Endemic  +
Castilleja brevistyla +
Endemic  +
Castilleja campestris +
Illustrated  +, Endemic  +
Castilleja campestris var. campestris +
Illustrated  +, Endemic  +
Castilleja campestris var. succulenta +
Illustrated  +, Endemic  +, Conservation concern  +
Castilleja cervina +
Illustrated  +, Endemic  +
Castilleja chambersii +
Endemic  +, Conservation concern  +
Castilleja chlorotica +
Illustrated  +, Endemic  +
Castilleja christii +
Endemic  +, Conservation concern  +
Castilleja chromosa +
Illustrated  +, Endemic  +
Castilleja chrymactis +
Endemic  +
Castilleja chrysantha +
Endemic  +
Castilleja cinerea +
Endemic  +, Conservation concern  +
Castilleja citrina +
Endemic  +
Castilleja coccinea +
Illustrated  +, Endemic  +
Castilleja collegiorum +
Endemic  +, Conservation concern  +
Castilleja covilleana +
Endemic  +
Castilleja crista-galli +
Endemic  +
Castilleja cryptantha +
Illustrated  +, Endemic  +, Conservation concern  +
Castilleja cusickii +
Illustrated  +, Endemic  +
Castilleja densiflora var. densiflora +
Endemic  +
Castilleja densiflora var. obispoënsis +
Endemic  +, Conservation concern  +
Castilleja dissitiflora +
Endemic  +
Castilleja disticha +
Illustrated  +, Endemic  +
Castilleja elata +
Endemic  +
Castilleja elmeri +
Illustrated  +, Endemic  +
Castilleja exserta var. latifolia +
Endemic  +
Castilleja exserta var. venusta +
Endemic  +
Castilleja flava +
Illustrated  +, Endemic  +
Castilleja flava var. flava +
Illustrated  +, Endemic  +
Castilleja flava var. rustica +
Illustrated  +, Endemic  +
Castilleja foliolosa +
Illustrated  +
Castilleja fraterna +
Endemic  +, Conservation concern  +
Castilleja glandulifera +
Endemic  +
Castilleja gleasoni +
Endemic  +, Conservation concern  +
Castilleja gracillima +
Endemic  +
Castilleja grisea +
Endemic  +, Conservation concern  +
Castilleja haydenii +
Endemic  +
Castilleja hispida +
Illustrated  +, Endemic  +
Castilleja hispida var. acuta +
Illustrated  +, Endemic  +
Castilleja hispida var. hispida +
Illustrated  +, Endemic  +
Castilleja hololeuca +
Illustrated  +, Endemic  +
Castilleja kaibabensis +
Endemic  +, Conservation concern  +
Castilleja kerryana +
Endemic  +, Conservation concern  +
Castilleja kraliana +
Endemic  +, Conservation concern  +
Castilleja lacera +
Endemic  +
Castilleja lanata +
Illustrated  +
Castilleja lasiorhyncha +
Endemic  +, Conservation concern  +
Castilleja lassenensis +
Endemic  +
Castilleja latifolia +
Endemic  +
Castilleja lemmonii +
Endemic  +
Castilleja leschkeana +
Endemic  +, Conservation concern  +
Castilleja levisecta +
Illustrated  +, Endemic  +, Conservation concern  +
Castilleja linariifolia +
Illustrated  +, Endemic  +
Castilleja lindheimeri +
Endemic  +
Castilleja lineariloba +
Endemic  +
Castilleja lineata +
Illustrated  +, Endemic  +
Castilleja litoralis +
Endemic  +
Castilleja lutescens +
Endemic  +
Castilleja martini var. clokeyi +
Endemic  +
Castilleja mendocinensis +
Endemic  +, Conservation concern  +
Castilleja mexicana +
Illustrated  +
Castilleja miniata +
Illustrated  +
Castilleja miniata var. dixonii +
Endemic  +
Castilleja miniata var. fulva +
Endemic  +
Castilleja miniata var. miniata +
Illustrated  +, Endemic  +
Castilleja miniata var. oblongifolia +
Illustrated  +
Castilleja minor +
Illustrated  +
Castilleja minor var. exilis +
Illustrated  +, Endemic  +
Castilleja minor var. minor +
Illustrated  +
Castilleja minor var. spiralis +
Illustrated  +, Endemic  +
Castilleja minor var. stenantha +
Illustrated  +
Castilleja mogollonica +
Endemic  +, Conservation concern  +
Castilleja mollis +
Endemic  +, Conservation concern  +
Castilleja montigena +
Endemic  +
Castilleja nana +
Endemic  +
Castilleja nervata +
Conservation concern  +
Castilleja nivea +
Endemic  +
Castilleja occidentalis +
Endemic  +
Castilleja oresbia +
Endemic  +
Castilleja organorum +
Endemic  +, Conservation concern  +
Castilleja ornata +
Illustrated  +, Conservation concern  +
Castilleja pallescens +
Endemic  +
Castilleja pallescens var. inverta +
Endemic  +
Castilleja pallescens var. pallescens +
Endemic  +
Castilleja pallida +
Illustrated  +
Castilleja pallida var. caudata +
Illustrated  +
Castilleja pallida var. yukonis +
Illustrated  +, Endemic  +
Castilleja parviflora +
Illustrated  +, Endemic  +
Castilleja parviflora var. albida +
Endemic  +
Castilleja parviflora var. olympica +
Endemic  +, Conservation concern  +
Castilleja parviflora var. oreopola +
Illustrated  +, Endemic  +
Castilleja parviflora var. parviflora +
Endemic  +
Castilleja parvula +
Endemic  +, Conservation concern  +
Castilleja patriotica +
Illustrated  +
Castilleja peckiana +
Endemic  +
Castilleja peirsonii +
Illustrated  +, Endemic  +
Castilleja pilosa +
Illustrated  +, Endemic  +
Castilleja pilosa var. longispica +
Illustrated  +, Endemic  +
Castilleja pilosa var. pilosa +
Illustrated  +, Endemic  +
Castilleja pilosa var. steenensis +
Illustrated  +, Endemic  +
Castilleja plagiotoma +
Illustrated  +, Endemic  +
Castilleja praeterita +
Endemic  +, Conservation concern  +
Castilleja pruinosa +
Illustrated  +, Endemic  +
Castilleja puberula +
Endemic  +, Conservation concern  +
Castilleja pulchella +
Endemic  +
Castilleja purpurascens +
Endemic  +, Conservation concern  +
Castilleja purpurea +
Endemic  +
Castilleja raupii +
Endemic  +
Castilleja revealii +
Endemic  +, Conservation concern  +
Castilleja rhexiifolia +
Endemic  +
Castilleja rubicundula +
Endemic  +
Castilleja rubicundula var. lithospermoides +
Endemic  +
Castilleja rubicundula var. rubicundula +
Endemic  +, Conservation concern  +
Castilleja rubida +
Endemic  +, Conservation concern  +
Castilleja rupicola +
Illustrated  +, Endemic  +
Castilleja salsuginosa +
Endemic  +, Conservation concern  +
Castilleja scabrida +
Endemic  +
Castilleja scabrida var. barnebyana +
Endemic  +
Castilleja scabrida var. scabrida +
Endemic  +
Castilleja schizotricha +
Endemic  +, Conservation concern  +
Castilleja septentrionalis +
Illustrated  +, Endemic  +
Castilleja sessiliflora +
Illustrated  +
Castilleja subinclusa var. franciscana +
Endemic  +, Conservation concern  +
Castilleja subinclusa var. subinclusa +
Endemic  +
Castilleja suksdorfii +
Endemic  +
Castilleja tenuiflora +
Illustrated  +
Castilleja tenuiflora var. tenuiflora +
Illustrated  +
Castilleja tenuis +
Endemic  +
Castilleja thompsonii +
Illustrated  +, Endemic  +
Castilleja tomentosa +
Conservation concern  +
Castilleja uliginosa +
Endemic  +, Conservation concern  +
Castilleja victoriae +
Illustrated  +, Endemic  +, Conservation concern  +
Castilleja viscidula +
Illustrated  +, Endemic  +
Castilleja wightii +
Endemic  +
Castilleja wootonii +
Endemic  +
Castilleja xanthotricha +
Endemic  +
Casuarina cunninghamiana +
W1  +, Introduced  +, Illustrated  +
Casuarina cunninghamiana subsp. cunninghamiana +
Illustrated  +, Introduced  +
Casuarina equisetifolia +
W1  +, Introduced  +
Casuarina equisetifolia subsp. equisetifolia +
Illustrated  +, Introduced  +
Casuarina glauca +
W1  +, Illustrated  +, Introduced  +
Catopsis berteroniana +
Illustrated  +
Catoscopium nigritum +
Illustrated  +
Caulanthus amplexicaulis +
Endemic  +
Caulanthus barnebyi +
Endemic  +, Conservation concern  +
Caulanthus californicus +
Illustrated  +, Endemic  +
Caulanthus coulteri +
Endemic  +
Caulanthus crassicaulis +
Endemic  +
Caulanthus flavescens +
Endemic  +, Conservation concern  +
Caulanthus glaucus +
Endemic  +, Conservation concern  +
Caulanthus hallii +
Endemic  +, Conservation concern  +
Caulanthus inflatus +
Illustrated  +, Endemic  +
Caulanthus lemmonii +
Endemic  +, Conservation concern  +
Caulanthus major +
Endemic  +
Caulanthus pilosus +
Endemic  +
Caulanthus simulans +
Endemic  +
Caulophyllum giganteum +
Endemic  +
Caulophyllum thalictroides +
Endemic  +, Illustrated  +
Causonis +
Introduced  +
Causonis japonica +
Introduced  +, Illustrated  +
Cayaponia quinqueloba +
Endemic  +, Illustrated  +
Ceanothus americanus +
Illustrated  +, Endemic  +
Ceanothus arcuatus +
Endemic  +
Ceanothus confusus +
Endemic  +, Conservation concern  +
Ceanothus cordulatus +
Illustrated  +
Ceanothus crassifolius var. planus +
Endemic  +
Ceanothus cuneatus +
Illustrated  +
Ceanothus cuneatus var. cuneatus +
Illustrated  +
Ceanothus cuneatus var. fascicularis +
Endemic  +, Conservation concern  +
Ceanothus cuneatus var. ramulosus +
Illustrated  +, Endemic  +
Ceanothus cuneatus var. rigidus +
Endemic  +, Conservation concern  +
Ceanothus cyaneus +
Conservation concern  +
Ceanothus dentatus +
Endemic  +
Ceanothus divergens +
Endemic  +, Conservation concern  +
Ceanothus diversifolius +
Endemic  +
Ceanothus ferrisiae +
Endemic  +, Conservation concern  +
Ceanothus foliosus +
Endemic  +
Ceanothus foliosus var. foliosus +
Endemic  +
Ceanothus foliosus var. medius +
Endemic  +
Ceanothus foliosus var. vineatus +
Endemic  +, Conservation concern  +
Ceanothus fresnensis +
Endemic  +, Conservation concern  +
Ceanothus gloriosus +
Endemic  +
Ceanothus gloriosus var. exaltatus +
Endemic  +
Ceanothus gloriosus var. gloriosus +
Endemic  +
Ceanothus gloriosus var. porrectus +
Endemic  +, Conservation concern  +
Ceanothus griseus +
Endemic  +
Ceanothus hearstiorum +
Endemic  +, Conservation concern  +
Ceanothus impressus +
Endemic  +
Ceanothus impressus var. impressus +
Endemic  +
Ceanothus impressus var. nipomensis +
Endemic  +, Conservation concern  +
Ceanothus incanus +
Endemic  +
Ceanothus integerrimus +
Illustrated  +, Endemic  +
Ceanothus jepsonii +
Illustrated  +, Endemic  +
Ceanothus jepsonii var. albiflorus +
Endemic  +
Ceanothus jepsonii var. jepsonii +
Illustrated  +, Endemic  +
Ceanothus lemmonii +
Endemic  +
Ceanothus maritimus +
Endemic  +, Conservation concern  +
Ceanothus martini +
Endemic  +
Ceanothus masonii +
Endemic  +, Conservation concern  +
Ceanothus megacarpus +
Endemic  +
Ceanothus megacarpus var. insularis +
Endemic  +
Ceanothus megacarpus var. megacarpus +
Endemic  +
Ceanothus microphyllus +
Illustrated  +, Endemic  +
Ceanothus oliganthus var. oliganthus +
Endemic  +
Ceanothus oliganthus var. sorediatus +
Endemic  +
Ceanothus ophiochilus +
Endemic  +, Conservation concern  +
Ceanothus otayensis +
Conservation concern  +
Ceanothus parryi +
Endemic  +
Ceanothus parvifolius +
Endemic  +
Ceanothus pauciflorus +
Illustrated  +
Ceanothus pinetorum +
Endemic  +
Ceanothus prostratus +
Illustrated  +, Endemic  +
Ceanothus prostratus var. occidentalis +
Endemic  +, Conservation concern  +
Ceanothus prostratus var. prostratus +
Illustrated  +, Endemic  +
Ceanothus pumilus +
Endemic  +
Ceanothus purpureus +
Endemic  +, Conservation concern  +
Ceanothus roderickii +
Endemic  +, Conservation concern  +
Ceanothus sanguineus +
Endemic  +
Ceanothus sonomensis +
Endemic  +, Conservation concern  +
Ceanothus tomentosus var. tomentosus +
Endemic  +
Ceanothus velutinus +
Endemic  +
Ceanothus velutinus var. laevigatus +
Endemic  +
Ceanothus velutinus var. velutinus +
Endemic  +
Celastrus orbiculatus +
Weedy  +, Introduced  +
Celastrus scandens +
Illustrated  +, Endemic  +
Celosia argentea +
Weedy  +, Introduced  +, Illustrated  +
Celosia cristata +
Introduced  +
Celosia nitida +
Illustrated  +
Celosia trigyna +
Introduced  +
Celtis laevigata +
Illustrated  +
Celtis lindheimeri +
Conservation concern  +
Celtis occidentalis +
Illustrated  +
Celtis pallida +
Illustrated  +
Celtis tenuifolia +
Endemic  +
Cenchrus biflorus +
Introduced  +
Cenchrus tribuloides +
Endemic  +
Centaurea benedicta +
Introduced  +, Illustrated  +
Centaurea calcitrapa +
Introduced  +
Centaurea cyanus +
Introduced  +
Centaurea diffusa +
Introduced  +
Centaurea diluta +
Introduced  +
Centaurea iberica +
Introduced  +
Centaurea jacea +
Introduced  +
Centaurea macrocephala +
Introduced  +
Centaurea melitensis +
Introduced  +
Centaurea montana +
Introduced  +
Centaurea nigra +
Introduced  +
Centaurea nigrescens +
Introduced  +
Centaurea phrygia +
Introduced  +
Centaurea scabiosa +
Introduced  +
Centaurea solstitialis +
Introduced  +, Illustrated  +
Centaurea stoebe subsp. micranthos +
Introduced  +, Illustrated  +
Centaurea sulphurea +
Introduced  +
Centaurea virgata +
Weedy  +, Introduced  +
Centaurea virgata subsp. squarrosa +
Weedy  +, Introduced  +
Centratherum punctatum +
Illustrated  +
Centromadia fitchii +
Endemic  +
Centromadia parryi subsp. australis +
Conservation concern  +
Centromadia parryi subsp. congdonii +
Endemic  +, Conservation concern  +
Centromadia parryi subsp. rudis +
Endemic  +
Centromadia pungens +
Conservation concern  +
Centromadia pungens subsp. laevis +
Conservation concern  +
Centromadia pungens subsp. pungens +
Illustrated  +
Centrostegia thurberi +
Illustrated  +
Cephalanthera austiniae +
Illustrated  +, Endemic  +
Cerastium aleuticum +
Endemic  +
Cerastium arvense +
Weedy  +, Illustrated  +
Cerastium arvense subsp. arvense +
Weedy  +, Illustrated  +
Cerastium arvense subsp. strictum +
Illustrated  +
Cerastium beeringianum +
Illustrated  +, Endemic  +
Cerastium brachypetalum +
Introduced  +
Cerastium brachypodum +
Illustrated  +
Cerastium cerastoides +
Illustrated  +
Cerastium dichotomum +
Introduced  +
Cerastium diffusum +
Introduced  +
Cerastium dubium +
Introduced  +
Cerastium fontanum subsp. vulgare +
Weedy  +, Introduced  +
Cerastium glomeratum +
Weedy  +, Introduced  +
Cerastium nutans +
Weedy  +, Illustrated  +
Cerastium nutans var. nutans +
Weedy  +, Illustrated  +, Endemic  +
Cerastium nutans var. obtectum +
Weedy  +, Illustrated  +
Cerastium pumilum +
Introduced  +
Cerastium semidecandrum +
Introduced  +
Cerastium terrae-novae +
Endemic  +
Cerastium texanum +
Illustrated  +
Cerastium tomentosum +
Introduced  +
Cerastium velutinum +
Endemic  +
Cerastium velutinum var. velutinum +
Endemic  +
Cerastium velutinum var. villossissimum +
Endemic  +
Cerastium viride +
Endemic  +
Ceratiola ericoides +
Illustrated  +, Endemic  +
Ceratophyllum demersum +
W2  +, Illustrated  +
Ceratophyllum echinatum +
Endemic  +, Illustrated  +, Weedy  +
Ceratopteris pteridoides +
Illustrated  +
Ceratopteris thalictroides +
Illustrated  +
Ceratotheca +
Introduced  +
Ceratotheca triloba +
Introduced  +, Illustrated  +
Cercocarpus betuloides +
Illustrated  +
Cercocarpus betuloides var. betuloides +
Illustrated  +
Cercocarpus betuloides var. blancheae +
Illustrated  +
Cercocarpus betuloides var. traskiae +
Conservation concern  +, Endemic  +
Cercocarpus ledifolius var. intricatus +
Endemic  +
Cercocarpus ledifolius var. ledifolius +
Endemic  +
Cevallia sinuata +
Illustrated  +
Chaenactis alpigena +
Endemic  +
Chaenactis carphoclinia +
Illustrated  +
Chaenactis carphoclinia var. carphoclinia +
Illustrated  +
Chaenactis carphoclinia var. peirsonii +
Endemic  +, Conservation concern  +
Chaenactis cusickii +
Endemic  +, Conservation concern  +
Chaenactis douglasii +
Illustrated  +, Endemic  +
Chaenactis douglasii var. alpina +
Illustrated  +, Endemic  +
Chaenactis douglasii var. douglasii +
Illustrated  +, Endemic  +
Chaenactis evermannii +
Endemic  +
Chaenactis glabriuscula var. heterocarpha +
Endemic  +
Chaenactis glabriuscula var. lanosa +
Endemic  +
Chaenactis glabriuscula var. megacephala +
Endemic  +
Chaenactis glabriuscula var. orcuttiana +
Conservation concern  +
Chaenactis macrantha +
Endemic  +
Chaenactis nevadensis +
Endemic  +
Chaenactis nevii +
Endemic  +
Chaenactis parishii +
Conservation concern  +
Chaenactis santolinoides +
Endemic  +, Conservation concern  +
Chaenactis stevioides +
Illustrated  +
Chaenactis suffrutescens +
Endemic  +, Conservation concern  +
Chaenactis thompsonii +
Endemic  +, Conservation concern  +
Chaenactis xantiana +
Illustrated  +, Endemic  +
Chaenomeles +
Introduced  +
Chaenomeles japonica +
Introduced  +
Chaenomeles speciosa +
Illustrated  +, Introduced  +
Chaenorhinum +
Introduced  +
Chaenorhinum minus +
Weedy  +, Introduced  +, Illustrated  +
Chaenorhinum minus subsp. minus +
Weedy  +, Introduced  +, Illustrated  +
Chaetadelpha wheeleri +
Illustrated  +, Endemic  +
Chaetopappa asteroides +
Illustrated  +
Chaetopappa asteroides var. asteroides +
Illustrated  +
Chaetopappa asteroides var. grandis +
Endemic  +
Chaetopappa bellidifolia +
Endemic  +
Chaetopappa effusa +
Endemic  +
Chaetopappa ericoides +
Illustrated  +
Chaetopappa hersheyi +
Endemic  +
Chaetopappa imberbis +
Endemic  +
Chamaebatia foliolosa +
Endemic  +, Illustrated  +
Chamaebatiaria +
Endemic  +
Chamaebatiaria millefolium +
Endemic  +, Illustrated  +
Chamaechaenactis scaposa +
Illustrated  +, Endemic  +
Chamaecyparis lawsoniana +
Endemic  +
Chamaecyparis nootkatensis +
Endemic  +
Chamaecyparis thyoides +
Illustrated  +, Endemic  +
Chamaedaphne calyculata +
Illustrated  +
Chamaedorea seifrizii +
Introduced  +, Illustrated  +
Chamaelirium luteum +
Illustrated  +, Endemic  +
Chamaemelum fuscatum +
Introduced  +
Chamaemelum nobile +
Introduced  +, Illustrated  +
Chamaerhodos erecta +
Illustrated  +
Chaptalia tomentosa +
Illustrated  +, Endemic  +
Chasmanthe floribunda +
Introduced  +, Illustrated  +
Chasmanthium latifolium +
Endemic  +
Chasmanthium laxum +
Endemic  +
Chasmanthium nitidum +
Endemic  +
Chasmanthium sessiliflorum +
Endemic  +
Cheilanthes alabamensis +
Illustrated  +
Cheilanthes cooperae +
Endemic  +
Cheilanthes covillei +
Illustrated  +
Cheilanthes eatonii +
Illustrated  +
Cheilanthes feei +
Illustrated  +
Cheilanthes fendleri +
Illustrated  +
Cheilanthes gracillima +
Endemic  +
Cheilanthes intertexta +
Endemic  +
Cheilanthes lanosa +
Endemic  +
Cheilanthes lendigera +
Illustrated  +
Cheilanthes pringlei +
Illustrated  +
Cheilanthes tomentosa +
Illustrated  +
Cheilanthes wrightii +
Illustrated  +
Cheiroglossa palmata +
Illustrated  +
Chelidonium majus +
W2  +, Illustrated  +, Introduced  +
Chelone +
Endemic  +
Chelone cuthbertii +
Endemic  +
Chelone glabra +
Illustrated  +, Endemic  +
Chelone lyonii +
Endemic  +
Chelone obliqua +
Endemic  +
Chelone obliqua var. erwiniae +
Endemic  +
Chelone obliqua var. obliqua +
Endemic  +
Chelone obliqua var. speciosa +
Endemic  +
Chenopodium albescens +
Endemic  +
Chenopodium album +
Weedy  +, Introduced  +, Illustrated  +
Chenopodium atrovirens +
Illustrated  +, Endemic  +
Chenopodium berlandieri +
Weedy  +, Illustrated  +
Chenopodium berlandieri var. berlandieri +
Weedy  +, Illustrated  +
Chenopodium berlandieri var. boscianum +
Endemic  +
Chenopodium berlandieri var. bushianum +
Endemic  +
Chenopodium berlandieri var. macrocalycium +
Endemic  +
Chenopodium berlandieri var. sinuatum +
Endemic  +
Chenopodium berlandieri var. zschackei +
Illustrated  +, Endemic  +
Chenopodium bonus-henricus +
Weedy  +, Introduced  +
Chenopodium californicum +
Illustrated  +
Chenopodium capitatum +
Weedy  +, Illustrated  +
Chenopodium capitatum var. capitatum +
Weedy  +, Illustrated  +
Chenopodium capitatum var. parvicapitatum +
Endemic  +
Chenopodium chenopodioides +
Illustrated  +
Chenopodium cycloides +
Illustrated  +, Endemic  +
Chenopodium desiccatum +
Weedy  +, Endemic  +
Chenopodium foliosum +
Introduced  +
Chenopodium fremontii +
Illustrated  +
Chenopodium glaucum +
Illustrated  +
Chenopodium glaucum var. glaucum +
Illustrated  +
Chenopodium glaucum var. salinum +
Endemic  +
Chenopodium hians +
Endemic  +
Chenopodium incanum +
Weedy  +, Illustrated  +
Chenopodium incanum var. elatum +
Weedy  +, Illustrated  +
Chenopodium incanum var. incanum +
Weedy  +, Illustrated  +
Chenopodium incanum var. occidentale +
Endemic  +
Chenopodium leptophyllum +
Weedy  +, Endemic  +
Chenopodium macrospermum +
Introduced  +
Chenopodium murale +
Weedy  +, Introduced  +, Illustrated  +
Chenopodium neomexicanum +
Endemic  +
Chenopodium nevadense +
Illustrated  +, Endemic  +
Chenopodium opulifolium +
Introduced  +
Chenopodium pallescens +
Endemic  +
Chenopodium polyspermum +
Weedy  +, Introduced  +
Chenopodium polyspermum var. acutifolium +
Introduced  +
Chenopodium polyspermum var. polyspermum +
Weedy  +, Introduced  +
Chenopodium pratericola +
Weedy  +, Illustrated  +, Endemic  +
Chenopodium rubrum +
Weedy  +, Illustrated  +
Chenopodium rubrum var. humile +
Endemic  +
Chenopodium rubrum var. rubrum +
Illustrated  +
Chenopodium simplex +
Weedy  +, Illustrated  +, Endemic  +
Chenopodium standleyanum +
Illustrated  +, Endemic  +
Chenopodium strictum +
Weedy  +, Introduced  +, Illustrated  +
Chenopodium subglabrum +
Endemic  +
Chenopodium urbicum +
Weedy  +, Introduced  +
Chenopodium vulvaria +
Introduced  +
Chenopodium watsonii +
Illustrated  +, Endemic  +
Chimaphila maculata +
Illustrated  +
Chimaphila menziesii +
Endemic  +
Chionodoxa luciliae +
Introduced  +, Illustrated  +
Chionophila +
Endemic  +
Chionophila jamesii +
Illustrated  +, Endemic  +
Chionophila tweedyi +
Endemic  +
Chloracantha spinosa +
Illustrated  +
Chloracantha spinosa var. spinosa +
Illustrated  +
Chloris berroi +
Introduced  +
Chloris canterae +
Introduced  +
Chloris canterae var. canterae +
Introduced  +
Chloris canterae var. grandiflora +
Introduced  +
Chloris texensis +
Endemic  +
Chlorocrambe hastata +
Illustrated  +, Endemic  +
Chlorogalum angustifolium +
Illustrated  +, Endemic  +
Chlorogalum grandiflorum +
Endemic  +, Conservation concern  +
Chlorogalum parviflorum +
Illustrated  +
Chlorogalum pomeridianum +
W1  +, Illustrated  +, Endemic  +
Chlorogalum pomeridianum var. divaricatum +
Endemic  +
Chlorogalum pomeridianum var. minus +
Endemic  +, Conservation concern  +
Chlorogalum pomeridianum var. pomeridianum +
Illustrated  +, Endemic  +
Chlorogalum purpureum +
Endemic  +, Conservation concern  +
Chlorogalum purpureum var. purpureum +
Endemic  +, Conservation concern  +
Chlorogalum purpureum var. reductum +
Endemic  +, Conservation concern  +
Chloropyron maritimum +
Illustrated  +
Chloropyron maritimum subsp. canescens +
Illustrated  +, Endemic  +
Chloropyron maritimum subsp. maritimum +
Conservation concern  +
Chloropyron maritimum subsp. palustre +
Endemic  +, Conservation concern  +
Chloropyron molle +
Endemic  +, Conservation concern  +
Chloropyron molle subsp. hispidum +
Endemic  +, Conservation concern  +
Chloropyron molle subsp. molle +
Endemic  +, Conservation concern  +
Chloropyron palmatum +
Endemic  +, Conservation concern  +
Chloropyron tecopense +
Endemic  +
Chondrilla juncea +
Weedy  +, Introduced  +, Illustrated  +
Chorisiva nevadensis +
Illustrated  +, Endemic  +
Chorispora tenella +
Weedy  +, Introduced  +, Illustrated  +
Chorizanthe angustifolia +
Endemic  +, Conservation concern  +
Chorizanthe biloba +
Endemic  +
Chorizanthe biloba var. biloba +
Endemic  +
Chorizanthe biloba var. immemora +
Endemic  +
Chorizanthe blakleyi +
Endemic  +, Conservation concern  +
Chorizanthe brevicornu +
Illustrated  +
Chorizanthe brevicornu var. brevicornu +
Illustrated  +
Chorizanthe brevicornu var. spathulata +
Endemic  +
Chorizanthe breweri +
Endemic  +, Conservation concern  +
Chorizanthe clevelandii +
Endemic  +
Chorizanthe cuspidata +
Endemic  +, Conservation concern  +
Chorizanthe cuspidata var. cuspidata +
Endemic  +, Conservation concern  +
Chorizanthe cuspidata var. villosa +
Endemic  +, Conservation concern  +
Chorizanthe diffusa +
Endemic  +
Chorizanthe douglasii +
Illustrated  +, Endemic  +
Chorizanthe howellii +
Endemic  +, Conservation concern  +
Chorizanthe membranacea +
Illustrated  +, Endemic  +
Chorizanthe obovata +
Endemic  +
Chorizanthe orcuttiana +
Endemic  +, Conservation concern  +
Chorizanthe palmeri +
Illustrated  +, Endemic  +
Chorizanthe parryi +
Endemic  +, Conservation concern  +
Chorizanthe parryi var. fernandina +
Endemic  +, Conservation concern  +
Chorizanthe parryi var. parryi +
Endemic  +, Conservation concern  +
Chorizanthe polygonoides var. polygonoides +
Endemic  +
Chorizanthe pungens +
Illustrated  +, Endemic  +, Conservation concern  +
Chorizanthe pungens var. hartwegiana +
Endemic  +, Conservation concern  +
Chorizanthe pungens var. pungens +
Illustrated  +, Endemic  +, Conservation concern  +
Chorizanthe rectispina +
Endemic  +, Conservation concern  +
Chorizanthe rigida +
Illustrated  +
Chorizanthe robusta +
Endemic  +, Conservation concern  +
Chorizanthe robusta var. hartwegii +
Endemic  +, Conservation concern  +
Chorizanthe robusta var. robusta +
Endemic  +, Conservation concern  +
Chorizanthe spinosa +
Endemic  +
Chorizanthe staticoides +
Illustrated  +, Endemic  +
Chorizanthe stellulata +
Endemic  +
Chorizanthe uniaristata +
Endemic  +
Chorizanthe valida +
Endemic  +, Conservation concern  +
Chorizanthe ventricosa +
Endemic  +
Chorizanthe watsonii +
Illustrated  +, Endemic  +
Chorizanthe wheeleri +
Endemic  +
Chorizanthe xanti +
Endemic  +
Chorizanthe xanti var. leucotheca +
Endemic  +
Chorizanthe xanti var. xanti +
Endemic  +
Chromolaena frustrata +
Endemic  +
Chromolaena ivifolia +
Illustrated  +
Chrysactinia mexicana +
Illustrated  +
Chrysanthemoides monilifera +
Introduced  +, Illustrated  +
Chryso-hypnum diminutivum +
Illustrated  +
Chrysobalanus icaco +
Illustrated  +
Chrysobalanus icaco subsp. icaco +
Illustrated  +
Chrysogonum virginianum +
Illustrated  +, Endemic  +
Chrysogonum virginianum var. australe +
Endemic  +
Chrysogonum virginianum var. brevistolon +
Illustrated  +, Endemic  +
Chrysogonum virginianum var. virginianum +
Endemic  +
Chrysolepis chrysophylla +
Endemic  +
Chrysolepis chrysophylla var. chrysophylla +
Endemic  +
Chrysolepis chrysophylla var. minor +
Endemic  +
Chrysolepis sempervirens +
Endemic  +, Illustrated  +
Chrysoma pauciflosculosa +
Illustrated  +, Endemic  +
Chrysophyllum oliviforme +
Illustrated  +
Chrysophyllum oliviforme subsp. oliviforme +
Illustrated  +
Chrysopogon fulvus +
Introduced  +
Chrysopsis floridana +
Endemic  +, Conservation concern  +
Chrysopsis godfreyi +
Endemic  +, Conservation concern  +
Chrysopsis gossypina +
Illustrated  +, Endemic  +
Chrysopsis gossypina subsp. cruiseana +
Illustrated  +, Endemic  +
Chrysopsis gossypina subsp. gossypina +
Illustrated  +, Endemic  +
Chrysopsis gossypina subsp. hyssopifolia +
Endemic  +
Chrysopsis lanuginosa +
Endemic  +
Chrysopsis latisquamea +
Endemic  +
Chrysopsis linearifolia +
Endemic  +
Chrysopsis linearifolia subsp. dressii +
Endemic  +
Chrysopsis linearifolia subsp. linearifolia +
Endemic  +
Chrysopsis mariana +
Endemic  +
Chrysopsis scabrella +
Illustrated  +, Endemic  +
Chrysopsis subulata +
Endemic  +
Chrysosplenium americanum +
Endemic  +
Chrysosplenium glechomifolium +
Endemic  +
Chrysosplenium iowense +
Illustrated  +, Endemic  +
Chrysosplenium tetrandrum +
Illustrated  +
Chrysothamnus depressus +
Endemic  +
Chrysothamnus eremobius +
Endemic  +, Conservation concern  +
Chrysothamnus greenei +
Illustrated  +, Endemic  +
Chrysothamnus humilis +
Endemic  +
Chrysothamnus molestus +
Illustrated  +, Endemic  +
Chrysothamnus scopulorum +
Endemic  +
Chrysothamnus stylosus +
Endemic  +
Chrysothamnus vaseyi +
Endemic  +
Chrysothamnus viscidiflorus +
Endemic  +
Chrysothamnus viscidiflorus subsp. axillaris +
Endemic  +
Chrysothamnus viscidiflorus subsp. lanceolatus +
Endemic  +
Chrysothamnus viscidiflorus subsp. planifolius +
Endemic  +
Chrysothamnus viscidiflorus subsp. puberulus +
Endemic  +
Chrysothamnus viscidiflorus subsp. viscidiflorus +
Endemic  +
Cichorium intybus +
Introduced  +, Illustrated  +
Cienfuegosia yucatanensis +
Illustrated  +
Cimicifuga americana +
Endemic  +, Illustrated  +
Cimicifuga arizonica +
Conservation concern  +, Endemic  +
Cimicifuga elata +
Conservation concern  +, Endemic  +
Cimicifuga laciniata +
Endemic  +
Cimicifuga racemosa +
W1  +, Endemic  +
Cimicifuga rubifolia +
Endemic  +, Illustrated  +
Cinclidium stygium +
Illustrated  +
Cinclidium subrotundum +
Illustrated  +
Cinna arundinacea +
Endemic  +
Cinna bolanderi +
Endemic  +
Cinnamomum camphora +
Illustrated  +, Introduced  +
Cirriphyllum piliferum +
Illustrated  +
Cirsium altissimum +
Endemic  +
Cirsium andersonii +
Endemic  +
Cirsium andrewsii +
Endemic  +, Conservation concern  +
Cirsium arizonicum +
Illustrated  +
Cirsium arizonicum var. arizonicum +
Endemic  +
Cirsium arizonicum var. bipinnatum +
Endemic  +
Cirsium arizonicum var. chellyense +
Endemic  +, Conservation concern  +
Cirsium arizonicum var. rothrockii +
Endemic  +
Cirsium arizonicum var. tenuisectum +
Illustrated  +
Cirsium arvense +
Introduced  +
Cirsium barnebyi +
Endemic  +, Conservation concern  +
Cirsium brevifolium +
Endemic  +
Cirsium brevistylum +
Endemic  +
Cirsium canescens +
Endemic  +
Cirsium carolinianum +
Endemic  +
Cirsium ciliolatum +
Endemic  +, Conservation concern  +
Cirsium clavatum +
Endemic  +
Cirsium clavatum var. americanum +
Endemic  +
Cirsium clavatum var. clavatum +
Endemic  +
Cirsium clavatum var. osterhoutii +
Endemic  +
Cirsium crassicaule +
Endemic  +, Conservation concern  +
Cirsium cymosum +
Endemic  +
Cirsium cymosum var. canovirens +
Endemic  +
Cirsium cymosum var. cymosum +
Endemic  +
Cirsium discolor +
Illustrated  +, Endemic  +
Cirsium douglasii +
Illustrated  +, Endemic  +
Cirsium douglasii var. breweri +
Illustrated  +, Endemic  +
Cirsium douglasii var. douglasii +
Endemic  +
Cirsium drummondii +
Endemic  +
Cirsium eatonii +
Illustrated  +, Endemic  +
Cirsium eatonii var. clokeyi +
Endemic  +, Conservation concern  +
Cirsium eatonii var. eatonii +
Endemic  +
Cirsium eatonii var. eriocephalum +
Endemic  +
Cirsium eatonii var. hesperium +
Endemic  +
Cirsium eatonii var. murdockii +
Illustrated  +, Endemic  +, Conservation concern  +
Cirsium eatonii var. peckii +
Endemic  +
Cirsium eatonii var. viperinum +
Illustrated  +, Endemic  +
Cirsium edule +
Endemic  +
Cirsium edule var. edule +
Endemic  +
Cirsium edule var. macounii +
Endemic  +
Cirsium edule var. wenatchense +
Endemic  +
Cirsium engelmannii +
Endemic  +
Cirsium flodmanii +
Endemic  +
Cirsium foliosum +
Endemic  +
Cirsium fontinale +
Endemic  +, Conservation concern  +
Cirsium fontinale var. campylon +
Endemic  +, Conservation concern  +
Cirsium fontinale var. fontinale +
Endemic  +, Conservation concern  +
Cirsium fontinale var. obispoense +
Endemic  +, Conservation concern  +
Cirsium helenioides +
Conservation concern  +
Cirsium hookerianum +
Endemic  +
Cirsium horridulum +
Illustrated  +
Cirsium horridulum var. horridulum +
Endemic  +
Cirsium horridulum var. megacanthum +
Illustrated  +, Endemic  +
Cirsium horridulum var. vittatum +
Endemic  +
Cirsium hydrophilum +
Endemic  +, Conservation concern  +
Cirsium hydrophilum var. hydrophilum +
Endemic  +, Conservation concern  +
Cirsium hydrophilum var. vaseyi +
Endemic  +, Conservation concern  +
Cirsium inamoenum +
Endemic  +
Cirsium inamoenum var. davisii +
Endemic  +
Cirsium inamoenum var. inamoenum +
Endemic  +
Cirsium lecontei +
Endemic  +, Conservation concern  +
Cirsium longistylum +
Endemic  +, Conservation concern  +
Cirsium mohavense +
Endemic  +, Conservation concern  +
Cirsium muticum +
Endemic  +
Cirsium nuttallii +
Endemic  +
Cirsium occidentale +
Illustrated  +, Endemic  +
Cirsium occidentale var. californicum +
Illustrated  +, Endemic  +
Cirsium occidentale var. candidissimum +
Illustrated  +, Endemic  +
Cirsium occidentale var. compactum +
Endemic  +, Conservation concern  +
Cirsium occidentale var. coulteri +
Illustrated  +, Endemic  +, Conservation concern  +
Cirsium occidentale var. lucianum +
Illustrated  +, Endemic  +
Cirsium occidentale var. occidentale +
Endemic  +
Cirsium occidentale var. venustum +
Endemic  +
Cirsium ownbeyi +
Endemic  +
Cirsium palustre +
Introduced  +
Cirsium parryi +
Endemic  +
Cirsium perplexans +
Endemic  +, Conservation concern  +
Cirsium pitcheri +
Endemic  +
Cirsium praeteriens +
Endemic  +, Conservation concern  +
Cirsium pulcherrimum +
Endemic  +
Cirsium pulcherrimum var. aridum +
Endemic  +, Conservation concern  +
Cirsium pulcherrimum var. pulcherrimum +
Endemic  +
Cirsium pumilum +
Endemic  +
Cirsium pumilum var. hillii +
Endemic  +
Cirsium pumilum var. pumilum +
Endemic  +
Cirsium quercetorum +
Endemic  +
Cirsium remotifolium +
Illustrated  +, Endemic  +
Cirsium remotifolium var. odontolepis +
Illustrated  +, Endemic  +
Cirsium remotifolium var. remotifolium +
Illustrated  +, Endemic  +
Cirsium remotifolium var. rivulare +
Endemic  +
Cirsium repandum +
Endemic  +
Cirsium rhothophilum +
Endemic  +, Conservation concern  +
Cirsium rydbergii +
Endemic  +
Cirsium scariosum +
Illustrated  +
Cirsium scariosum var. americanum +
Illustrated  +
Cirsium scariosum var. citrinum +
Conservation concern  +
Cirsium scariosum var. coloradense +
Endemic  +
Cirsium scariosum var. congdonii +
Endemic  +
Cirsium scariosum var. robustum +
Illustrated  +
Cirsium scariosum var. scariosum +
Illustrated  +, Endemic  +
Cirsium scariosum var. thorneae +
Endemic  +
Cirsium scariosum var. toiyabense +
Illustrated  +
Cirsium tracyi +
Endemic  +
Cirsium vinaceum +
Illustrated  +, Endemic  +, Conservation concern  +
Cirsium virginianum +
Endemic  +
Cirsium vulgare +
Introduced  +
Cissampelos pareira +
Illustrated  +
Cissus trifoliata +
Illustrated  +
Cissus verticillata +
Weedy  +
Cistanthe ambigua +
Illustrated  +
Cistanthe maritima +
Illustrated  +
Cistanthe monandra +
Illustrated  +
Cistanthe monosperma +
Illustrated  +
Cistanthe parryi +
Illustrated  +
Cistanthe pulchella +
Endemic  +, Conservation concern  +
Cistanthe pygmaea +
Endemic  +
Cistanthe quadripetala +
Endemic  +
Cistanthe rosea +
Illustrated  +, Endemic  +
Cistanthe tweedyi +
Endemic  +, Conservation concern  +
Cistanthe umbellata +
Illustrated  +, Endemic  +
Cistus +
Introduced  +
Cistus incanus +
Illustrated  +, Introduced  +
Cistus ladanifer +
Introduced  +
Cistus monspeliensis +
Introduced  +
Cistus psilosepalus +
Introduced  +
Cistus salviifolius +
Introduced  +
Citrullus +
Introduced  +
Citrullus caffer +
Introduced  +
Citrullus colocynthis +
Introduced  +
Citrullus lanatus +
Illustrated  +, Introduced  +
Citrullus lanatus subsp. lanatus +
Illustrated  +, Introduced  +
Cladanthus mixtus +
Introduced  +, Illustrated  +
Cladium californicum +
Illustrated  +
Cladium jamaicense +
W1  +, Illustrated  +
Cladium mariscoides +
Illustrated  +, Endemic  +
Claopodium bolanderi +
Illustrated  +
Claopodium crispifolium +
Illustrated  +
Claopodium pellucinerve +
Illustrated  +
Claopodium whippleanum +
Illustrated  +
Clappia suaedifolia +
Illustrated  +
Clasmatodon parvulus +
Illustrated  +
Claytonia arenicola +
Endemic  +
Claytonia caroliniana +
Weedy  +, Endemic  +
Claytonia cordifolia +
Endemic  +
Claytonia exigua +
Illustrated  +, Endemic  +
Claytonia exigua subsp. exigua +
Illustrated  +, Endemic  +
Claytonia exigua subsp. glauca +
Illustrated  +, Endemic  +
Claytonia gypsophiloides +
Endemic  +
Claytonia lanceolata +
Endemic  +
Claytonia megarhiza +
Endemic  +
Claytonia multiscapa +
Illustrated  +
Claytonia nevadensis +
Endemic  +
Claytonia ogilviensis +
Endemic  +, Conservation concern  +
Claytonia palustris +
Endemic  +
Claytonia parviflora +
Illustrated  +, Endemic  +
Claytonia parviflora subsp. grandiflora +
Illustrated  +, Endemic  +
Claytonia parviflora subsp. parviflora +
Endemic  +
Claytonia parviflora subsp. utahensis +
Endemic  +
Claytonia parviflora subsp. viridis +
Endemic  +
Claytonia perfoliata +
Illustrated  +
Claytonia perfoliata subsp. intermontana +
Illustrated  +
Claytonia perfoliata subsp. mexicana +
Illustrated  +
Claytonia perfoliata subsp. perfoliata +
Endemic  +
Claytonia rubra +
Illustrated  +, Endemic  +
Claytonia rubra subsp. depressa +
Endemic  +
Claytonia rubra subsp. rubra +
Illustrated  +, Endemic  +
Claytonia sarmentosa +
Illustrated  +
Claytonia saxosa +
Endemic  +, Conservation concern  +
Claytonia umbellata +
Endemic  +, Conservation concern  +
Claytonia virginica +
Weedy  +, Illustrated  +, Endemic  +
Claytonia washingtoniana +
Endemic  +, Conservation concern  +
Cleistes bifaria +
Illustrated  +, Endemic  +
Cleistes divaricata +
Endemic  +
Clematis addisonii +
Conservation concern  +, Endemic  +
Clematis albicoma +
Endemic  +
Clematis baldwinii +
Endemic  +
Clematis bigelovii +
Endemic  +
Clematis catesbyana +
Endemic  +
Clematis coactilis +
Conservation concern  +, Endemic  +
Clematis columbiana +
Illustrated  +, Endemic  +
Clematis columbiana var. columbiana +
Endemic  +, Illustrated  +
Clematis columbiana var. tenuiloba +
Endemic  +, Illustrated  +
Clematis crispa +
Endemic  +, Illustrated  +
Clematis fremontii +
Endemic  +, Illustrated  +
Clematis glaucophylla +
Endemic  +
Clematis hirsutissima +
Illustrated  +, Endemic  +
Clematis hirsutissima var. hirsutissima +
Endemic  +, Illustrated  +
Clematis hirsutissima var. scottii +
Endemic  +
Clematis ligusticifolia +
Illustrated  +
Clematis morefieldii +
Conservation concern  +, Endemic  +, Illustrated  +
Clematis occidentalis +
Endemic  +
Clematis occidentalis var. dissecta +
Endemic  +
Clematis occidentalis var. grosseserrata +
Endemic  +
Clematis occidentalis var. occidentalis +
Endemic  +
Clematis ochroleuca +
Endemic  +
Clematis orientalis +
Illustrated  +, Introduced  +
Clematis pitcheri +
Illustrated  +
Clematis pitcheri var. dictyota +
Illustrated  +
Clematis pitcheri var. pitcheri +
Illustrated  +
Clematis recta +
Introduced  +
Clematis reticulata +
Endemic  +, Illustrated  +
Clematis socialis +
Conservation concern  +, Endemic  +, Illustrated  +
Clematis tangutica +
Introduced  +, Illustrated  +
Clematis tangutica var. tangutica +
Illustrated  +, Introduced  +
Clematis terniflora +
Introduced  +
Clematis texensis +
Endemic  +
Clematis versicolor +
Endemic  +
Clematis viorna +
Endemic  +, Illustrated  +
Clematis virginiana +
Endemic  +
Clematis vitalba +
Introduced  +
Clematis viticaulis +
Conservation concern  +, Endemic  +
Clematis viticella +
Illustrated  +, Introduced  +
Cleome ornithopodioides +
Introduced  +, Illustrated  +
Cleome rutidosperma +
Introduced  +
Cleomella angustifolia +
Illustrated  +, Endemic  +
Cleomella brevipes +
Endemic  +
Cleomella hillmanii +
Endemic  +
Cleomella hillmanii var. goodrichii +
Endemic  +
Cleomella hillmanii var. hillmanii +
Endemic  +
Cleomella obtusifolia +
Endemic  +
Cleomella parviflora +
Endemic  +
Cleomella plocasperma +
Endemic  +
Clethra acuminata +
Endemic  +
Clethra alnifolia +
Illustrated  +, Endemic  +
Clethra tomentosa +
Endemic  +
Cliftonia monophylla +
Illustrated  +, Endemic  +
Climacium americanum +
Illustrated  +
Climacium dendroides +
Illustrated  +
Clintonia andrewsiana +
Illustrated  +, Endemic  +
Clintonia borealis +
W1  +, Endemic  +
Clintonia umbellulata +
Endemic  +
Clintonia uniflora +
Illustrated  +, Endemic  +
Clusia rosea +
Illustrated  +
Cnidoscolus stimulosus +
Weedy  +, Illustrated  +, Endemic  +
Cnidoscolus texanus +
Weedy  +
Coccinia +
Introduced  +
Coccinia grandis +
Illustrated  +, Introduced  +
Coccoloba uvifera +
Illustrated  +
Coccothrinax argentata +
Illustrated  +
Cocculus carolinus +
Illustrated  +
Cochlearia groenlandica +
Illustrated  +, Endemic  +
Cochlearia sessilifolia +
Endemic  +, Conservation concern  +
Cochlearia tridactylites +
Endemic  +
Cocos nucifera +
Introduced  +, Illustrated  +
Coeloglossum viride +
Illustrated  +
Coelorachis cylindrica +
Endemic  +
Coelorachis rugosa +
Endemic  +
Coelorachis tessellata +
Endemic  +
Coelorachis tuberculosa +
Endemic  +
Coix lacryma-jobi +
Introduced  +
Coleogyne +
Endemic  +
Coleogyne ramosissima +
Endemic  +, Illustrated  +
Collinsia antonina +
Endemic  +, Conservation concern  +
Collinsia bartsiifolia +
Endemic  +
Collinsia bartsiifolia var. bartsiifolia +
Endemic  +
Collinsia bartsiifolia var. davidsonii +
Endemic  +
Collinsia bartsiifolia var. hirsuta +
Endemic  +
Collinsia bartsiifolia var. stricta +
Endemic  +
Collinsia callosa +
Endemic  +
Collinsia childii +
Endemic  +
Collinsia concolor +
Illustrated  +
Collinsia corymbosa +
Endemic  +, Conservation concern  +
Collinsia grandiflora +
Endemic  +
Collinsia greenei +
Illustrated  +, Endemic  +
Collinsia heterophylla var. austromontana +
Endemic  +
Collinsia latifolia +
Endemic  +
Collinsia linearis +
Endemic  +
Collinsia multicolor +
Endemic  +, Conservation concern  +
Collinsia parryi +
Endemic  +
Collinsia parviflora +
Illustrated  +, Endemic  +
Collinsia rattanii +
Endemic  +
Collinsia sparsiflora +
Endemic  +
Collinsia sparsiflora var. collina +
Endemic  +
Collinsia sparsiflora var. sparsiflora +
Endemic  +
Collinsia tinctoria +
Endemic  +
Collinsia torreyi +
Endemic  +
Collinsia verna +
Endemic  +
Collinsia violacea +
Illustrated  +, Endemic  +
Collinsia wrightii +
Endemic  +
Colocasia esculenta +
Introduced  +, Illustrated  +
Colubrina asiatica +
Introduced  +
Colubrina asiatica var. asiatica +
Introduced  +
Colubrina stricta +
Conservation concern  +
Colubrina texensis +
Illustrated  +, Endemic  +
Columbiadoria hallii +
Illustrated  +, Endemic  +
Comandra umbellata +
Illustrated  +
Comandra umbellata subsp. californica +
Endemic  +
Comandra umbellata subsp. pallida +
Illustrated  +
Comandra umbellata subsp. umbellata +
Illustrated  +, Endemic  +
Comarostaphylis diversifolia +
Illustrated  +
Comarostaphylis diversifolia subsp. diversifolia +
Conservation concern  +
Comarostaphylis diversifolia subsp. planifolia +
Illustrated  +, Endemic  +
Comarum palustre +
Illustrated  +
Commelina benghalensis +
Weedy  +, Introduced  +
Commelina caroliniana +
Introduced  +
Commelina communis +
Weedy  +, Introduced  +, Illustrated  +
Commelina dianthifolia +
Illustrated  +
Commelina diffusa +
Weedy  +, Introduced  +
Commelina diffusa var. diffusa +
Weedy  +, Introduced  +
Commelina diffusa var. gigas +
Introduced  +
Commelina erecta +
Illustrated  +
Commelina gambiae +
Introduced  +, Illustrated  +
Commelina virginica +
Illustrated  +, Endemic  +
Commicarpus scandens +
Illustrated  +
Comptonia peregrina +
W1  +, Endemic  +, Illustrated  +
Conardia compacta +
Illustrated  +
Condalia hookeri +
Illustrated  +
Conicosia pugioniformis +
Introduced  +, Illustrated  +
Conimitella williamsii +
Illustrated  +, Endemic  +
Conoclinium coelestinum +
Illustrated  +, Endemic  +
Conopholis alpina +
Illustrated  +
Conostomum tetragonum +
Illustrated  +
Conringia orientalis +
Weedy  +, Introduced  +, Illustrated  +
Consolea corallicola +
Illustrated  +, Endemic  +, Conservation concern  +
Consolida ajacis +
Illustrated  +, Introduced  +
Consolida pubescens +
Introduced  +
Consolida regalis +
Illustrated  +, Introduced  +
Consolida tenuissima +
Introduced  +
Constancea nevinii +
Illustrated  +, Endemic  +, Conservation concern  +
Convallaria majalis +
Illustrated  +
Convallaria majalis var. majalis +
Introduced  +
Convallaria majalis var. montana +
Illustrated  +, Endemic  +
Conyza bonariensis +
Introduced  +
Conyza canadensis +
Illustrated  +
Conyza floribunda +
Introduced  +
Conyza ramosissima +
Endemic  +
Coptis aspleniifolia +
Endemic  +, Illustrated  +
Coptis laciniata +
Endemic  +, Illustrated  +
Coptis occidentalis +
Endemic  +, Illustrated  +
Coptis trifolia +
W1  +, Illustrated  +
Corallorhiza maculata +
Illustrated  +
Corallorhiza maculata var. maculata +
Endemic  +
Corallorhiza maculata var. occidentalis +
Illustrated  +, Endemic  +
Corallorhiza mertensiana +
Endemic  +
Corallorhiza odontorhiza var. odontorhiza +
Endemic  +
Corallorhiza striata +
Illustrated  +
Corallorhiza striata var. striata +
Illustrated  +, Endemic  +
Corallorhiza striata var. vreelandii +
Illustrated  +
Corallorhiza wisteriana +
Illustrated  +
Corchorus aestuans +
Introduced  +, Weedy  +
Corchorus hirsutus +
Introduced  +
Corchorus hirtus +
Introduced  +
Corchorus siliquosus +
Illustrated  +
Corchorus tridens +
Introduced  +
Cordylanthus capitatus +
Illustrated  +, Endemic  +
Cordylanthus eremicus +
Endemic  +
Cordylanthus eremicus subsp. eremicus +
Endemic  +
Cordylanthus eremicus subsp. kernensis +
Endemic  +
Cordylanthus kingii +
Endemic  +
Cordylanthus kingii subsp. densiflorus +
Endemic  +
Cordylanthus kingii subsp. helleri +
Endemic  +
Cordylanthus kingii subsp. kingii +
Endemic  +
Cordylanthus nidularius +
Endemic  +, Conservation concern  +
Cordylanthus parviflorus +
Endemic  +
Cordylanthus pilosus +
Endemic  +
Cordylanthus pilosus subsp. pilosus +
Endemic  +
Cordylanthus pilosus subsp. trifidus +
Endemic  +
Cordylanthus pringlei +
Endemic  +, Conservation concern  +
Cordylanthus ramosus +
Endemic  +
Cordylanthus rigidus subsp. brevibracteatus +
Endemic  +
Cordylanthus rigidus subsp. littoralis +
Endemic  +, Conservation concern  +
Cordylanthus rigidus subsp. rigidus +
Endemic  +
Cordylanthus tenuis +
Illustrated  +, Endemic  +
Cordylanthus tenuis subsp. barbatus +
Endemic  +
Cordylanthus tenuis subsp. brunneus +
Endemic  +
Cordylanthus tenuis subsp. pallescens +
Endemic  +, Conservation concern  +
Cordylanthus tenuis subsp. tenuis +
Illustrated  +, Endemic  +
Cordylanthus tenuis subsp. viscidus +
Endemic  +
Cordylanthus wrightii subsp. kaibabensis +
Endemic  +
Cordylanthus wrightii subsp. tenuifolius +
Endemic  +
Corema conradii +
Illustrated  +, Endemic  +
Coreocarpus arizonicus +
Illustrated  +
Coreopsis auriculata +
Endemic  +
Coreopsis basalis +
Endemic  +
Coreopsis bigelovii +
Endemic  +
Coreopsis californica +
Illustrated  +, Endemic  +
Coreopsis calliopsidea +
Endemic  +
Coreopsis delphiniifolia +
Endemic  +
Coreopsis douglasii +
Endemic  +
Coreopsis gladiata +
Illustrated  +, Endemic  +
Coreopsis grandiflora +
Endemic  +
Coreopsis hamiltonii +
Endemic  +
Coreopsis integrifolia +
Endemic  +
Coreopsis intermedia +
Endemic  +
Coreopsis lanceolata +
Illustrated  +, Endemic  +
Coreopsis latifolia +
Endemic  +
Coreopsis leavenworthii +
Endemic  +
Coreopsis major +
Endemic  +
Coreopsis maritima +
Endemic  +
Coreopsis nudata +
Endemic  +
Coreopsis nuecensis +
Endemic  +
Coreopsis palmata +
Endemic  +
Coreopsis pubescens +
Endemic  +
Coreopsis pulchra +
Endemic  +
Coreopsis rosea +
Endemic  +
Coreopsis tinctoria +
Illustrated  +
Coreopsis tripteris +
Illustrated  +, Endemic  +
Coreopsis verticillata +
Endemic  +
Corethrogyne filaginifolia +
Illustrated  +
Corispermum americanum +
Illustrated  +
Corispermum americanum var. americanum +
Illustrated  +
Corispermum americanum var. rydbergii +
Illustrated  +
Corispermum hyssopifolium +
Weedy  +, Introduced  +, Illustrated  +
Corispermum nitidum +
Introduced  +, Illustrated  +
Corispermum pallasii +
Illustrated  +
Corispermum villosum +
Illustrated  +, Endemic  +
Cornus alternifolia +
Endemic  +
Cornus amomum +
Endemic  +
Cornus asperifolia +
Endemic  +
Cornus canadensis +
Weedy  +, Illustrated  +
Cornus drummondii +
Endemic  +
Cornus florida +
Weedy  +, Illustrated  +
Cornus foemina +
Endemic  +
Cornus glabrata +
Endemic  +
Cornus kousa +
Introduced  +
Cornus mas +
Introduced  +
Cornus nuttallii +
Weedy  +, Endemic  +
Cornus obliqua +
Endemic  +
Cornus occidentalis +
Endemic  +
Cornus racemosa +
Endemic  +
Cornus rugosa +
Endemic  +
Cornus sanguinea +
Introduced  +
Cornus sericea +
Illustrated  +
Cornus sessilis +
Illustrated  +, Endemic  +
Cornus subg. Syncarpea +
Introduced  +
Cornus unalaschkensis +
Endemic  +
Corrigiola litoralis +
Introduced  +, Illustrated  +
Corrigiola litoralis subsp. litoralis +
Introduced  +, Illustrated  +
Cortaderia jubata +
Introduced  +
Cortaderia selloana +
Introduced  +
Corydalis aqua-gelidae +
Endemic  +
Corydalis aurea +
W2  +, Illustrated  +
Corydalis aurea subsp. aurea +
Illustrated  +
Corydalis aurea subsp. occidentalis +
W2  +, Illustrated  +
Corydalis caseana +
W2  +, Illustrated  +, Endemic  +
Corydalis caseana subsp. brachycarpa +
Conservation concern  +, Endemic  +
Corydalis caseana subsp. brandegei +
Conservation concern  +, Endemic  +
Corydalis caseana subsp. caseana +
Endemic  +, Illustrated  +
Corydalis caseana subsp. cusickii +
Endemic  +
Corydalis caseana subsp. hastata +
Endemic  +
Corydalis crystallina +
Endemic  +
Corydalis curvisiliqua +
Endemic  +
Corydalis curvisiliqua subsp. curvisiliqua +
Endemic  +
Corydalis curvisiliqua subsp. grandibracteata +
Endemic  +
Corydalis flavula +
Endemic  +
Corydalis micrantha +
Endemic  +
Corydalis micrantha subsp. australis +
Endemic  +
Corydalis micrantha subsp. micrantha +
Endemic  +
Corydalis micrantha subsp. texensis +
Endemic  +
Corydalis scouleri +
Endemic  +, Illustrated  +
Corydalis sempervirens +
W1  +, Endemic  +, Illustrated  +
Corylus americana +
Endemic  +, Illustrated  +
Corylus avellana +
Introduced  +
Corylus cornuta +
Illustrated  +, Endemic  +
Corylus cornuta subsp. californica +
Endemic  +
Corylus cornuta subsp. cornuta +
Endemic  +, Illustrated  +
Corynephorus canescens +
Introduced  +
Coryphantha alversonii +
Endemic  +, Conservation concern  +
Coryphantha chlorantha +
Endemic  +
Coryphantha dasyacantha +
Endemic  +
Coryphantha duncanii +
Endemic  +, Conservation concern  +
Coryphantha hesteri +
Endemic  +, Conservation concern  +
Coryphantha macromeris +
Illustrated  +
Coryphantha minima +
Illustrated  +, Endemic  +, Conservation concern  +
Coryphantha missouriensis +
Illustrated  +, Endemic  +
Coryphantha nickelsiae +
Conservation concern  +
Coryphantha ramillosa +
Conservation concern  +
Coryphantha recurvata +
Illustrated  +
Coryphantha robbinsorum +
Conservation concern  +
Coryphantha sneedii +
Conservation concern  +
Coryphantha sulcata +
Endemic  +
Coryphantha tuberculosa +
Illustrated  +
Cosmos bipinnatus +
Illustrated  +
Cosmos caudatus +
Introduced  +
Cosmos sulphureus +
Introduced  +
Cota tinctoria +
Introduced  +, Illustrated  +
Cotoneaster +
Introduced  +
Cotoneaster adpressus +
Introduced  +
Cotoneaster atropurpureus +
Illustrated  +, Introduced  +
Cotoneaster cochleatus +
Introduced  +
Cotoneaster conspicuus +
Introduced  +
Cotoneaster crispii +
Introduced  +
Cotoneaster dammeri +
Introduced  +
Cotoneaster dielsianus +
Introduced  +
Cotoneaster divaricatus +
Illustrated  +, Introduced  +
Cotoneaster fangianus +
Introduced  +
Cotoneaster franchetii +
Illustrated  +, Introduced  +
Cotoneaster frigidus +
Introduced  +
Cotoneaster gamblei +
Introduced  +
Cotoneaster hjelmqvistii +
Introduced  +
Cotoneaster hodjingensis +
Introduced  +
Cotoneaster horizontalis +
Illustrated  +, Introduced  +
Cotoneaster integrifolius +
Introduced  +
Cotoneaster lacteus +
Introduced  +
Cotoneaster lucidus +
Illustrated  +, Introduced  +
Cotoneaster magnificus +
Introduced  +
Cotoneaster melanocarpus +
Introduced  +
Cotoneaster miniatus +
Introduced  +
Cotoneaster monopyrenus +
Introduced  +
Cotoneaster nitens +
Introduced  +
Cotoneaster pannosus +
Illustrated  +, Introduced  +
Cotoneaster qungbixiensis +
Introduced  +
Cotoneaster rehderi +
Introduced  +
Cotoneaster salicifolius +
Introduced  +
Cotoneaster simonsii +
Illustrated  +, Introduced  +
Cotoneaster sternianus +
Introduced  +
Cotoneaster tengyuehensis +
Introduced  +
Cotoneaster transens +
Introduced  +
Cotoneaster vestitus +
Introduced  +
Cotoneaster villosulus +
Introduced  +
Cotoneaster ×suecicus +
Introduced  +
Cottsia gracilis +
Illustrated  +
Cotula australis +
Introduced  +
Cotula coronopifolia +
Introduced  +, Illustrated  +
Cotyledon orbiculata +
Introduced  +, Illustrated  +
Cotyledon orbiculata var. oblonga +
Introduced  +, Illustrated  +
Crambe maritima +
Introduced  +, Illustrated  +
Cranichis muscosa +
Illustrated  +
Crassula aquatica +
Illustrated  +
Crassula connata +
Weedy  +, Illustrated  +
Crassula tillaea +
Introduced  +
Crataegus +
Endemic  +
Crataegus (sect. Brevispinae) ser. Brevispinae +
Endemic  +
Crataegus (sect. Coccineae) ser. Aestivales +
Endemic  +
Crataegus (sect. Coccineae) ser. Apricae +
Endemic  +
Crataegus (sect. Coccineae) ser. Bracteatae +
Endemic  +
Crataegus (sect. Coccineae) ser. Coccineae +
Endemic  +
Crataegus (sect. Coccineae) ser. Crus-galli +
Endemic  +
Crataegus (sect. Coccineae) ser. Dilatatae +
Endemic  +
Crataegus (sect. Coccineae) ser. Greggianae +
Conservation concern  +
Crataegus (sect. Coccineae) ser. Intricatae +
Endemic  +
Crataegus (sect. Coccineae) ser. Lacrimatae +
Endemic  +
Crataegus (sect. Coccineae) ser. Madrenses +
Endemic  +
Crataegus (sect. Coccineae) ser. Molles +
Endemic  +
Crataegus (sect. Coccineae) ser. Parvifoliae +
Endemic  +
Crataegus (sect. Coccineae) ser. Populneae +
Endemic  +
Crataegus (sect. Coccineae) ser. Pruinosae +
Endemic  +
Crataegus (sect. Coccineae) ser. Pulcherrimae +
Endemic  +
Crataegus (sect. Coccineae) ser. Punctatae +
Endemic  +
Crataegus (sect. Coccineae) ser. Rotundifoliae +
Endemic  +
Crataegus (sect. Coccineae) ser. Tenuifoliae +
Endemic  +
Crataegus (sect. Coccineae) ser. Triflorae +
Endemic  +
Crataegus (sect. Coccineae) ser. Virides +
Endemic  +
Crataegus (sect. Crataegus) ser. Apiifoliae +
Endemic  +
Crataegus (sect. Crataegus) ser. Cordatae +
Endemic  +
Crataegus (sect. Crataegus) ser. Crataegus +
Endemic  +
Crataegus (sect. Crataegus) ser. Microcarpae +
Endemic  +
Crataegus (sect. Douglasia) ser. Cerrones +
Endemic  +
Crataegus (sect. Douglasia) ser. Douglasianae +
Endemic  +
Crataegus (sect. Douglasia) ser. Purpureofructus +
Endemic  +
Crataegus (sect. Macracanthae) ser. Anomalae +
Endemic  +
Crataegus (sect. Macracanthae) ser. Macracanthae +
Endemic  +
Crataegus (sect. Sanguineae) ser. Altaicae +
Introduced  +
Crataegus (sect. Unassigned) ser. Montaninsulae +
Endemic  +
Crataegus aemula +
Endemic  +
Crataegus aestivalis +
Endemic  +
Crataegus alabamensis +
Endemic  +
Crataegus alleghaniensis +
Endemic  +
Crataegus annosa +
Endemic  +
Crataegus aprica +
Endemic  +
Crataegus aquacervensis +
Endemic  +
Crataegus ashei +
Endemic  +
Crataegus atrovirens +
Endemic  +
Crataegus attrita +
Endemic  +
Crataegus austromontana +
Conservation concern  +, Endemic  +
Crataegus beata +
Endemic  +
Crataegus berberifolia +
Endemic  +
Crataegus berberifolia var. berberifolia +
Endemic  +
Crataegus berberifolia var. engelmannii +
Endemic  +
Crataegus biltmoreana +
Endemic  +, Illustrated  +
Crataegus brachyacantha +
Endemic  +, Illustrated  +
Crataegus brainerdii +
Endemic  +
Crataegus brazoria +
Conservation concern  +, Endemic  +
Crataegus brittonii +
Conservation concern  +, Endemic  +
Crataegus buckleyi +
Endemic  +
Crataegus calpodendron +
Endemic  +
Crataegus castlegarensis +
Endemic  +
Crataegus chrysocarpa +
Endemic  +
Crataegus chrysocarpa var. blanchardii +
Endemic  +
Crataegus chrysocarpa var. chrysocarpa +
Endemic  +
Crataegus chrysocarpa var. faxonii +
Endemic  +
Crataegus chrysocarpa var. phoeniceoides +
Endemic  +
Crataegus chrysocarpa var. piperi +
Endemic  +
Crataegus chrysocarpa var. praecox +
Endemic  +
Crataegus chrysocarpa var. subrotundifolia +
Endemic  +
Crataegus chrysocarpa var. vernonensis +
Conservation concern  +, Endemic  +
Crataegus chrysocarpa var. vigintistamina +
Endemic  +
Crataegus coccinea +
Endemic  +
Crataegus coccinea var. coccinea +
Endemic  +
Crataegus coccinea var. fulleriana +
Endemic  +
Crataegus coccinea var. pringlei +
Endemic  +
Crataegus coccinioides +
Endemic  +
Crataegus cognata +
Endemic  +
Crataegus collina +
Endemic  +
Crataegus collina var. collina +
Endemic  +
Crataegus collina var. hirtiflora +
Endemic  +
Crataegus collina var. lettermanii +
Endemic  +
Crataegus collina var. sordida +
Conservation concern  +, Endemic  +
Crataegus collina var. succincta +
Endemic  +
Crataegus colonica +
Endemic  +
Crataegus communis +
Conservation concern  +, Endemic  +
Crataegus compacta +
Endemic  +
Crataegus condigna +
Endemic  +
Crataegus craytonii +
Conservation concern  +, Endemic  +
Crataegus crocea +
Endemic  +, Illustrated  +
Crataegus crus-galli +
Endemic  +
Crataegus crus-galli var. crus-galli +
Endemic  +
Crataegus crus-galli var. pyracanthifolia +
Endemic  +
Crataegus cupressocollina +
Endemic  +, Illustrated  +
Crataegus delawarensis +
Conservation concern  +, Endemic  +
Crataegus dispar +
Endemic  +
Crataegus dodgei +
Endemic  +, Illustrated  +
Crataegus douglasii +
Endemic  +, Illustrated  +
Crataegus egens +
Endemic  +, Illustrated  +
Crataegus egregia +
Endemic  +
Crataegus enderbyensis +
Endemic  +
Crataegus erythropoda +
Endemic  +
Crataegus exilis +
Conservation concern  +, Endemic  +
Crataegus eximia +
Conservation concern  +, Endemic  +
Crataegus extraria +
Endemic  +
Crataegus fecunda +
Conservation concern  +, Endemic  +
Crataegus flabellata +
Endemic  +
Crataegus flava +
Conservation concern  +, Endemic  +
Crataegus florens +
Endemic  +
Crataegus floridana +
Endemic  +, Illustrated  +
Crataegus florifera +
Endemic  +
Crataegus fluviatilis +
Endemic  +
Crataegus formosa +
Conservation concern  +, Endemic  +
Crataegus frugiferens +
Endemic  +
Crataegus furtiva +
Endemic  +
Crataegus gattingeri +
Endemic  +
Crataegus gaylussacia +
Endemic  +
Crataegus gilva +
Endemic  +
Crataegus greggiana +
Conservation concern  +
Crataegus harbisonii +
Conservation concern  +, Endemic  +
Crataegus holmesiana +
Endemic  +
Crataegus ignava +
Endemic  +, Illustrated  +
Crataegus incilis +
Endemic  +
Crataegus integra +
Endemic  +
Crataegus intricata +
Endemic  +
Crataegus invicta +
Conservation concern  +, Endemic  +
Crataegus iracunda +
Endemic  +
Crataegus irrasa +
Endemic  +
Crataegus jesupii +
Conservation concern  +, Endemic  +
Crataegus jonesiae +
Conservation concern  +, Endemic  +
Crataegus lacrimata +
Endemic  +
Crataegus laevigata +
Introduced  +
Crataegus lanata +
Endemic  +
Crataegus lancei +
Endemic  +
Crataegus lanuginosa +
Conservation concern  +, Endemic  +
Crataegus lassa +
Endemic  +, Illustrated  +
Crataegus laurentiana +
Endemic  +
Crataegus leonensis +
Endemic  +
Crataegus lepida +
Conservation concern  +, Endemic  +
Crataegus levis +
Endemic  +
Crataegus lumaria +
Endemic  +
Crataegus macracantha +
Endemic  +, Illustrated  +
Crataegus macrosperma +
Endemic  +
Crataegus magniflora +
Endemic  +
Crataegus margarettae +
Endemic  +
Crataegus margarettae var. angustifolia +
Conservation concern  +, Endemic  +
Crataegus margarettae var. brownii +
Endemic  +
Crataegus margarettae var. margarettae +
Endemic  +
Crataegus margarettae var. meiophylla +
Endemic  +
Crataegus marshallii +
Endemic  +
Crataegus mendosa +
Endemic  +, Illustrated  +
Crataegus meridiana +
Endemic  +
Crataegus mira +
Endemic  +, Illustrated  +
Crataegus mollis +
Endemic  +, Illustrated  +
Crataegus mollis var. dumetosa +
Conservation concern  +, Endemic  +
Crataegus mollis var. incisifolia +
Endemic  +
Crataegus mollis var. meridionalis +
Endemic  +
Crataegus mollis var. mollis +
Illustrated  +, Endemic  +
Crataegus mollis var. viburnifolia +
Conservation concern  +, Endemic  +
Crataegus monogyna +
Introduced  +
Crataegus monogyna var. monogyna +
Introduced  +
Crataegus munda +
Endemic  +
Crataegus nananixonii +
Endemic  +
Crataegus neobushii +
Endemic  +
Crataegus nitida +
Conservation concern  +, Endemic  +
Crataegus oakesiana +
Conservation concern  +, Endemic  +
Crataegus okanaganensis +
Endemic  +, Illustrated  +
Crataegus okanaganensis var. okanaganensis +
Illustrated  +, Endemic  +
Crataegus okanaganensis var. wellsii +
Endemic  +
Crataegus okennonii +
Endemic  +
Crataegus opaca +
Endemic  +, Illustrated  +
Crataegus opima +
Endemic  +
Crataegus orbicularis +
Conservation concern  +, Endemic  +
Crataegus ouachitensis +
Conservation concern  +, Endemic  +
Crataegus ouachitensis var. minor +
Conservation concern  +, Endemic  +
Crataegus ouachitensis var. ouachitensis +
Conservation concern  +, Endemic  +
Crataegus padifolia +
Conservation concern  +, Endemic  +
Crataegus padifolia var. incarnata +
Conservation concern  +, Endemic  +
Crataegus padifolia var. padifolia +
Endemic  +, Conservation concern  +
Crataegus pennsylvanica +
Endemic  +
Crataegus persimilis +
Endemic  +
Crataegus pexa +
Endemic  +
Crataegus phaenopyrum +
Endemic  +
Crataegus phippsii +
Endemic  +
Crataegus pinetorum +
Endemic  +
Crataegus populnea +
Endemic  +
Crataegus prona +
Endemic  +
Crataegus pruinosa +
Endemic  +, Illustrated  +
Crataegus pruinosa var. dissona +
Endemic  +
Crataegus pruinosa var. magnifolia +
Conservation concern  +, Endemic  +
Crataegus pruinosa var. parvula +
Endemic  +
Crataegus pruinosa var. pruinosa +
Illustrated  +, Endemic  +
Crataegus pruinosa var. rugosa +
Endemic  +
Crataegus pruinosa var. virella +
Endemic  +
Crataegus pulcherrima +
Endemic  +
Crataegus punctata +
Endemic  +, Illustrated  +
Crataegus purpurella +
Endemic  +
Crataegus quaesita +
Endemic  +
Crataegus reverchonii +
Endemic  +, Illustrated  +
Crataegus reverchonii var. mohrii +
Endemic  +
Crataegus reverchonii var. palmeri +
Endemic  +
Crataegus reverchonii var. reverchonii +
Endemic  +, Illustrated  +
Crataegus rivularis +
Endemic  +, Illustrated  +
Crataegus rivuloadamensis +
Endemic  +
Crataegus rivulopugnensis +
Endemic  +
Crataegus roribacca +
Conservation concern  +, Endemic  +
Crataegus rubella +
Endemic  +
Crataegus rubribracteolata +
Endemic  +
Crataegus saligna +
Endemic  +
Crataegus sargentii +
Endemic  +
Crataegus scabrida +
Endemic  +
Crataegus scabrida var. asperifolia +
Endemic  +
Crataegus scabrida var. cyclophylla +
Conservation concern  +, Endemic  +
Crataegus scabrida var. egglestonii +
Endemic  +
Crataegus scabrida var. scabrida +
Endemic  +
Crataegus schizophylla +
Conservation concern  +, Endemic  +
Crataegus schuettei +
Endemic  +, Illustrated  +
Crataegus schuettei var. cuneata +
Conservation concern  +, Endemic  +
Crataegus schuettei var. ferrissii +
Conservation concern  +, Endemic  +
Crataegus schuettei var. gigantea +
Conservation concern  +, Endemic  +
Crataegus schuettei var. schuettei +
Endemic  +, Illustrated  +
Crataegus sect. Brevispinae +
Endemic  +
Crataegus sect. Coccineae +
Endemic  +
Crataegus sect. Crataegus +
Endemic  +
Crataegus sect. Douglasia +
Endemic  +
Crataegus sect. Macracanthae +
Endemic  +
Crataegus sect. Sanguineae +
Introduced  +
Crataegus segnis +
Endemic  +
Crataegus senta +
Endemic  +
Crataegus sheila-phippsiae +
Endemic  +
Crataegus sheila-phippsiae var. saskatchewanensis +
Endemic  +
Crataegus sheila-phippsiae var. sheila-phippsiae +
Endemic  +
Crataegus sheridana +
Endemic  +
Crataegus shuswapensis +
Conservation concern  +, Endemic  +
Crataegus sororia +
Endemic  +
Crataegus spathulata +
Illustrated  +, Endemic  +
Crataegus spes-aestatum +
Conservation concern  +, Endemic  +
Crataegus stolonifera +
Endemic  +
Crataegus stonei +
Conservation concern  +, Endemic  +
Crataegus submollis +
Endemic  +
Crataegus suborbiculata +
Conservation concern  +, Endemic  +
Crataegus succulenta +
Endemic  +
Crataegus succulenta var. gemmosa +
Endemic  +
Crataegus succulenta var. michiganensis +
Endemic  +
Crataegus succulenta var. neofluvialis +
Endemic  +
Crataegus succulenta var. pisifera +
Endemic  +
Crataegus succulenta var. succulenta +
Endemic  +
Crataegus tecta +
Endemic  +
Crataegus teres +
Endemic  +
Crataegus texana +
Endemic  +
Crataegus texana var. dasyphylla +
Endemic  +
Crataegus texana var. texana +
Endemic  +
Crataegus tracyi +
Endemic  +
Crataegus triflora +
Endemic  +, Illustrated  +
Crataegus turnerorum +
Endemic  +
Crataegus uniflora +
Illustrated  +
Crataegus ursopedensis +
Endemic  +
Crataegus venusta +
Endemic  +
Crataegus viridis +
Endemic  +, Illustrated  +
Crataegus viridis var. glabriuscula +
Endemic  +
Crataegus viridis var. lanceolata +
Endemic  +
Crataegus viridis var. nitens +
Endemic  +
Crataegus viridis var. ovata +
Endemic  +, Illustrated  +
Crataegus viridis var. velutina +
Endemic  +
Crataegus viridis var. viridis +
Illustrated  +, Endemic  +
Crataegus visenda +
Endemic  +
Crataegus wattiana +
Introduced  +
Crataegus wattiana var. wattiana +
Introduced  +
Crataegus williamsii +
Endemic  +
Crataegus wootoniana +
Conservation concern  +, Endemic  +
Crataegus ×atrorubens +
Endemic  +
Crataegus ×bicknellii +
Endemic  +
Crataegus ×coleae +
Endemic  +
Crataegus ×collicola +
Endemic  +
Crataegus ×disperma +
Endemic  +
Crataegus ×dispessa +
Endemic  +
Crataegus ×fretalis +
Endemic  +
Crataegus ×incaedua +
Endemic  +
Crataegus ×kelloggii +
Endemic  +
Crataegus ×latebrosa +
Endemic  +
Crataegus ×lucorum +
Endemic  +
Crataegus ×rufula +
Endemic  +
Crataegus ×sicca +
Endemic  +
Crataegus ×vailiae +
Endemic  +
Cratoneuron filicinum +
Illustrated  +
Crepis acuminata +
Illustrated  +, Endemic  +
Crepis atribarba +
Endemic  +
Crepis bakeri +
Endemic  +
Crepis bakeri subsp. bakeri +
Endemic  +
Crepis bakeri subsp. cusickii +
Endemic  +
Crepis bakeri subsp. idahoensis +
Endemic  +, Conservation concern  +
Crepis barbigera +
Endemic  +
Crepis biennis +
Introduced  +
Crepis bursifolia +
Introduced  +
Crepis capillaris +
Introduced  +
Crepis elegans +
Endemic  +
Crepis foetida +
Introduced  +
Crepis intermedia +
Endemic  +
Crepis modocensis +
Endemic  +
Crepis modocensis subsp. glareosa +
Endemic  +, Conservation concern  +
Crepis modocensis subsp. modocensis +
Endemic  +
Crepis modocensis subsp. rostrata +
Endemic  +
Crepis modocensis subsp. subacaulis +
Endemic  +
Crepis monticola +
Endemic  +
Crepis nana +
Illustrated  +
Crepis occidentalis +
Illustrated  +, Endemic  +
Crepis occidentalis subsp. conjuncta +
Endemic  +
Crepis occidentalis subsp. costata +
Endemic  +
Crepis occidentalis subsp. occidentalis +
Illustrated  +, Endemic  +
Crepis occidentalis subsp. pumila +
Endemic  +
Crepis pannonica +
Introduced  +
Crepis pleurocarpa +
Endemic  +
Crepis pulchra +
Introduced  +, Illustrated  +
Crepis rubra +
Introduced  +
Crepis runcinata +
Illustrated  +
Crepis runcinata subsp. andersonii +
Endemic  +
Crepis runcinata subsp. barberi +
Illustrated  +
Crepis runcinata subsp. glauca +
Endemic  +
Crepis runcinata subsp. hallii +
Endemic  +
Crepis runcinata subsp. hispidulosa +
Endemic  +
Crepis runcinata subsp. imbricata +
Endemic  +
Crepis runcinata subsp. runcinata +
Illustrated  +, Endemic  +
Crepis setosa +
Introduced  +
Crepis tectorum +
Weedy  +, Introduced  +
Crepis vesicaria +
Introduced  +
Crepis zacintha +
Introduced  +
Crinum americanum +
Illustrated  +, Endemic  +
Crinum americanum var. americanum +
Illustrated  +, Endemic  +
Crinum americanum var. traubii +
Endemic  +
Crinum asiaticum +
Introduced  +
Crinum bulbispermum +
Introduced  +
Crinum zeylanicum +
Introduced  +
Crocanthemum arenicola +
Endemic  +
Crocanthemum bicknellii +
Endemic  +, Illustrated  +
Crocanthemum canadense +
Endemic  +
Crocanthemum carolinianum +
Endemic  +
Crocanthemum corymbosum +
Endemic  +
Crocanthemum dumosum +
Endemic  +
Crocanthemum georgianum +
Endemic  +
Crocanthemum greenei +
Conservation concern  +, Endemic  +
Crocanthemum nashii +
Endemic  +
Crocanthemum propinquum +
Endemic  +
Crocanthemum scoparium +
Illustrated  +
Crocanthemum scoparium var. scoparium +
Illustrated  +
Crocanthemum scoparium var. vulgare +
Illustrated  +
Crocanthemum suffrutescens +
Endemic  +
Crocidium multicaule +
Illustrated  +, Endemic  +
Croomia pauciflora +
Illustrated  +, Endemic  +
Croptilon divaricatum +
Illustrated  +, Endemic  +
Croptilon hookerianum +
Endemic  +
Croptilon hookerianum var. graniticum +
Endemic  +
Croptilon hookerianum var. hookerianum +
Endemic  +
Croptilon hookerianum var. validum +
Endemic  +
Crossopetalum ilicifolium +
Illustrated  +
Crossosoma bigelovii +
Illustrated  +
Crossosoma californicum +
Conservation concern  +
Croton alabamensis +
Endemic  +
Croton alabamensis var. alabamensis +
Endemic  +
Croton alabamensis var. texensis +
Endemic  +, Conservation concern  +
Croton argenteus +
Introduced  +
Croton argyranthemus +
Illustrated  +
Croton capitatus +
Weedy  +, Illustrated  +, Endemic  +
Croton coryi +
Endemic  +
Croton elliottii +
Endemic  +
Croton fruticulosus +
Illustrated  +
Croton glandulosus var. arenicola +
Endemic  +
Croton glandulosus var. floridanus +
Endemic  +
Croton glandulosus var. pubentissimus +
Endemic  +
Croton glandulosus var. septentrionalis +
Weedy  +, Endemic  +
Croton lindheimeri +
Illustrated  +, Endemic  +
Croton michauxii +
Illustrated  +, Endemic  +
Croton michauxii var. elliptica +
Endemic  +
Croton michauxii var. michauxii +
Illustrated  +, Endemic  +
Croton parksii +
Endemic  +
Croton pottsii var. thermophilus +
Conservation concern  +
Croton setigerus +
Weedy  +
Croton texensis +
Weedy  +, Illustrated  +
Croton wigginsii +
Conservation concern  +
Crupina vulgaris +
Weedy  +, Introduced  +, Illustrated  +
Cryphaea glomerata +
Endemic  +, Illustrated  +
Cryphaea nervosa +
Endemic  +, Illustrated  +
Cryphaea ravenelii +
Endemic  +
Crypsis alopecuroides +
Introduced  +
Crypsis schoenoides +
Introduced  +
Crypsis vaginiflora +
Introduced  +
Cryptogramma acrostichoides +
Illustrated  +
Cryptogramma cascadensis +
Endemic  +
Cryptogramma sitchensis +
Endemic  +
Ctenidium molluscum +
Illustrated  +
Ctenidium schofieldii +
Endemic  +, Illustrated  +
Ctenitis sloanei +
Illustrated  +
Ctenitis submarginalis +
Illustrated  +
Ctenium aromaticum +
Endemic  +
Ctenium floridanum +
Endemic  +
Ctenolepis +
Introduced  +
Ctenolepis cerasiformis +
Illustrated  +, Introduced  +
Cucumis +
Introduced  +
Cucumis anguria +
Introduced  +
Cucumis anguria var. anguria +
Introduced  +
Cucumis anguria var. longaculeatus +
Introduced  +
Cucumis dipsaceus +
Introduced  +
Cucumis melo +
Illustrated  +, Introduced  +
Cucumis melo subsp. agrestis +
Illustrated  +, Introduced  +
Cucumis melo subsp. melo +
Illustrated  +, Introduced  +
Cucumis metuliferus +
Introduced  +
Cucumis myriocarpus +
Introduced  +
Cucumis sativus +
Introduced  +
Cucumis sativus var. sativus +
Introduced  +
Cucurbita digitata +
Illustrated  +
Cucurbita ficifolia +
Introduced  +
Cucurbita maxima +
Introduced  +
Cucurbita melopepo +
Illustrated  +
Cucurbita melopepo subsp. melopepo +
Illustrated  +
Cucurbita melopepo subsp. texana +
Illustrated  +
Cucurbita melopepo var. melopepo +
Endemic  +
Cucurbita melopepo var. ozarkana +
Endemic  +
Cucurbita melopepo var. texana +
Endemic  +, Illustrated  +
Cucurbita moschata +
Introduced  +
Cucurbita okeechobeensis +
Conservation concern  +
Cucurbita okeechobeensis subsp. okeechobeensis +
Conservation concern  +
Cucurbita pepo +
Introduced  +
Cucurbita pepo subsp. pepo +
Introduced  +
Cuniculotinus gramineus +
Illustrated  +, Endemic  +
Cupressus bakeri +
Illustrated  +, Endemic  +, Conservation concern  +
Cupressus goveniana +
Endemic  +
Cupressus guadalupensis +
Conservation concern  +
Cupressus guadalupensis var. forbesii +
Conservation concern  +
Cupressus macnabiana +
Illustrated  +, Endemic  +
Cupressus macrocarpa +
Endemic  +, Conservation concern  +
Cupressus sargentii +
Endemic  +
Curcuma zedoaria +
Introduced  +, Illustrated  +
Cusickiella douglasii +
Illustrated  +, Endemic  +
Cusickiella quadricostata +
Endemic  +, Conservation concern  +
Cutandia memphitica +
Introduced  +
Cyanthillium cinereum +
Introduced  +, Illustrated  +
Cyclachaena xanthiifolia +
Illustrated  +, Endemic  +
Cyclanthera dissecta +
Endemic  +
Cyclanthera naudiniana +
Endemic  +, Illustrated  +
Cyclanthera stenura +
Endemic  +
Cyclodictyon varians +
Illustrated  +
Cycloloma atriplicifolium +
Weedy  +, Illustrated  +
Cyclopogon cranichoides +
Illustrated  +
Cydonia +
Introduced  +
Cydonia oblonga +
Illustrated  +, Introduced  +
Cylindropuntia abyssi +
Endemic  +
Cylindropuntia acanthocarpa +
Illustrated  +
Cylindropuntia acanthocarpa var. acanthocarpa +
Illustrated  +
Cylindropuntia acanthocarpa var. coloradensis +
Illustrated  +
Cylindropuntia acanthocarpa var. major +
Illustrated  +
Cylindropuntia acanthocarpa var. thornberi +
Endemic  +
Cylindropuntia bigelovii +
Illustrated  +
Cylindropuntia bigelovii var. bigelovii +
Illustrated  +
Cylindropuntia californica +
Illustrated  +
Cylindropuntia californica var. californica +
Illustrated  +
Cylindropuntia californica var. parkeri +
Illustrated  +
Cylindropuntia davisii +
Illustrated  +, Endemic  +
Cylindropuntia fulgida +
Illustrated  +
Cylindropuntia fulgida var. fulgida +
Illustrated  +
Cylindropuntia fulgida var. mamillata +
Illustrated  +
Cylindropuntia imbricata +
Illustrated  +
Cylindropuntia imbricata var. argentea +
Endemic  +, Conservation concern  +
Cylindropuntia imbricata var. imbricata +
Illustrated  +
Cylindropuntia leptocaulis +
Illustrated  +
Cylindropuntia ramosissima +
Illustrated  +
Cylindropuntia whipplei +
Endemic  +
Cymbalaria +
Introduced  +
Cymbalaria muralis +
Weedy  +, Introduced  +, Illustrated  +
Cymbalaria muralis subsp. muralis +
Weedy  +, Introduced  +, Illustrated  +
Cymophyllus fraserianus +
Illustrated  +, Endemic  +
Cynara cardunculus +
Weedy  +, Introduced  +, Illustrated  +
Cynara cardunculus subsp. cardunculus +
Weedy  +, Introduced  +
Cynara cardunculus subsp. flavescens +
Weedy  +, Introduced  +, Illustrated  +
Cyperus acuminatus +
Illustrated  +
Cyperus aggregatus +
Illustrated  +
Cyperus alopecuroides +
Introduced  +, Illustrated  +
Cyperus amabilis +
Illustrated  +
Cyperus articulatus +
W1  +, Illustrated  +
Cyperus bipartitus +
Illustrated  +
Cyperus cephalanthus +
Illustrated  +
Cyperus compressus +
W2  +, W1  +, Illustrated  +
Cyperus croceus +
Illustrated  +
Cyperus cuspidatus +
Illustrated  +
Cyperus dentatus +
Illustrated  +, Endemic  +
Cyperus dentoniae +
Illustrated  +
Cyperus diandrus +
Illustrated  +, Endemic  +
Cyperus difformis +
W2  +, W1  +, Introduced  +, …
Cyperus digitatus +
Illustrated  +
Cyperus dipsaceus +
Illustrated  +
Cyperus distans +
Illustrated  +
Cyperus distinctus +
Illustrated  +
Cyperus drummondii +
Illustrated  +
Cyperus echinatus +
Illustrated  +
Cyperus elegans +
Illustrated  +
Cyperus entrerianus +
Introduced  +, Illustrated  +
Cyperus eragrostis +
Illustrated  +
Cyperus erythrorhizos +
W2  +, W1  +, Illustrated  +
Cyperus esculentus +
W2  +, W1  +, Illustrated  +
Cyperus esculentus var. heermannii +
W2  +, W1  +, Illustrated  +
Cyperus esculentus var. leptostachyus +
Illustrated  +
Cyperus esculentus var. macrostachyus +
W2  +, W1  +, Illustrated  +
Cyperus fendlerianus +
Illustrated  +
Cyperus filicinus +
Illustrated  +, Endemic  +
Cyperus filiculmis +
Illustrated  +, Endemic  +
Cyperus filiformis +
Illustrated  +
Cyperus flavescens +
Illustrated  +
Cyperus flavicomus +
Introduced  +, Illustrated  +
Cyperus floribundus +
Illustrated  +
Cyperus fugax +
Illustrated  +
Cyperus fuligineus +
Illustrated  +
Cyperus fuscus +
Introduced  +, Illustrated  +
Cyperus giganteus +
Introduced  +, Illustrated  +
Cyperus grayi +
Illustrated  +, Endemic  +
Cyperus haspan +
Illustrated  +
Cyperus hermaphroditus +
Illustrated  +
Cyperus houghtonii +
Illustrated  +, Endemic  +
Cyperus hystricinus +
Illustrated  +, Endemic  +
Cyperus involucratus +
Introduced  +, Illustrated  +
Cyperus iria +
W2  +, W1  +, Introduced  +, …
Cyperus laevigatus +
Illustrated  +
Cyperus lancastriensis +
Illustrated  +, Endemic  +
Cyperus lanceolatus +
Illustrated  +
Cyperus lecontei +
W1  +, Illustrated  +, Endemic  +
Cyperus lentiginosus +
Illustrated  +
Cyperus ligularis +
W2  +, Illustrated  +
Cyperus lupulinus +
Illustrated  +, Endemic  +
Cyperus lupulinus subsp. lupulinus +
Endemic  +
Cyperus lupulinus subsp. macilentus +
Illustrated  +, Endemic  +
Cyperus manimae +
Illustrated  +
Cyperus manimae var. asperrimus +
Illustrated  +
Cyperus microiria +
Introduced  +, Illustrated  +
Cyperus mutisii +
Illustrated  +
Cyperus niger +
Illustrated  +
Cyperus ochraceus +
Illustrated  +
Cyperus odoratus +
W2  +, W1  +, Illustrated  +
Cyperus onerosus +
Illustrated  +, Endemic  +, Conservation concern  +
Cyperus ovatus +
Illustrated  +, Endemic  +
Cyperus owanii +
Introduced  +, Illustrated  +
Cyperus oxylepis +
Introduced  +, Illustrated  +
Cyperus pallidicolor +
Illustrated  +
Cyperus papyrus +
Introduced  +, Illustrated  +
Cyperus parishii +
Illustrated  +, Endemic  +
Cyperus pilosus +
Introduced  +, Illustrated  +
Cyperus planifolius +
Illustrated  +
Cyperus plukenetii +
Illustrated  +, Endemic  +
Cyperus polystachyos +
W2  +, W1  +, Illustrated  +
Cyperus prolifer +
Introduced  +, Illustrated  +
Cyperus prolixus +
Illustrated  +
Cyperus pseudothyrsiflorus +
Illustrated  +
Cyperus pseudovegetus +
W1  +, Illustrated  +, Endemic  +
Cyperus pumilus +
Introduced  +, Illustrated  +
Cyperus reflexus +
Illustrated  +
Cyperus refractus +
Illustrated  +, Endemic  +
Cyperus retroflexus +
Illustrated  +
Cyperus retrofractus +
Illustrated  +, Endemic  +
Cyperus retrorsus +
W2  +, W1  +, Illustrated  +
Cyperus rotundus +
W2  +, W1  +, Illustrated  +
Cyperus sanguinolentus +
Introduced  +, Illustrated  +
Cyperus schweinitzii +
Illustrated  +
Cyperus serotinus +
Introduced  +, Illustrated  +
Cyperus seslerioides +
Illustrated  +
Cyperus spectabilis +
Illustrated  +
Cyperus sphacelatus +
Introduced  +, Illustrated  +
Cyperus sphaerolepis +
Illustrated  +
Cyperus squarrosus +
W2  +, Illustrated  +
Cyperus strigosus +
W2  +, W1  +, Illustrated  +, …
Cyperus surinamensis +
W2  +, W1  +, Illustrated  +
Cyperus tetragonus +
Illustrated  +, Endemic  +
Cyperus thyrsiflorus +
Illustrated  +
Cyperus virens +
W1  +, Illustrated  +
Cyphomeris crassifolia +
Illustrated  +
Cyphomeris gypsophiloides +
Illustrated  +
Cypripedium acaule +
Illustrated  +, Endemic  +
Cypripedium arietinum +
Endemic  +
Cypripedium californicum +
Endemic  +
Cypripedium candidum +
Endemic  +
Cypripedium fasciculatum +
Endemic  +
Cypripedium guttatum +
Illustrated  +
Cypripedium kentuckiense +
Illustrated  +, Endemic  +
Cypripedium montanum +
Endemic  +
Cypripedium parviflorum +
Illustrated  +, Endemic  +
Cypripedium parviflorum var. makasin +
Endemic  +
Cypripedium parviflorum var. parviflorum +
Illustrated  +, Endemic  +
Cypripedium parviflorum var. pubescens +
Illustrated  +, Endemic  +
Cypripedium passerinum +
Illustrated  +, Endemic  +
Cypripedium reginae +
Illustrated  +, Endemic  +
Cypselea humifusa +
Introduced  +, Illustrated  +
Cyrilla racemiflora +
Illustrated  +
Cyrto-hypnum involvens +
Illustrated  +
Cyrtomium falcatum +
Introduced  +, Illustrated  +
Cyrtomium fortunei +
Introduced  +
Cyrtomium fortunei var. fortunei +
Introduced  +
Cyrtomnium hymenophylloides +
Illustrated  +
Cyrtomnium hymenophyllum +
Illustrated  +
Cyrtopodium polyphyllum +
Introduced  +, Illustrated  +
Cystopteris bulbifera +
Illustrated  +, Endemic  +
Cystopteris laurentiana +
Endemic  +
Cystopteris protrusa +
Endemic  +
Cystopteris reevesiana +
Illustrated  +
Cystopteris tenuis +
Illustrated  +, Endemic  +
D
Dacryophyllum +
Endemic  +
Dacryophyllum falcifolium +
Endemic  +, Illustrated  +
Dactyloctenium aegyptium +
Introduced  +
Dactylorhiza majalis +
Introduced  +, Illustrated  +
Dactylorhiza majalis var. junialis +
Introduced  +, Illustrated  +
Dalechampia +
Introduced  +
Dalechampia scandens +
Introduced  +, Illustrated  +
Daltonia splachnoides +
Illustrated  +
Damasonium californicum +
Illustrated  +, Endemic  +
Danthonia compressa +
Endemic  +
Danthonia decumbens +
Introduced  +
Danthonia parryi +
Endemic  +
Danthonia sericea +
Endemic  +
Danthonia unispicata +
Endemic  +
Daphne +
Introduced  +
Daphne laureola +
Introduced  +
Daphne mezereum +
Illustrated  +, Introduced  +
Darlingtonia californica +
Illustrated  +, Endemic  +
Darmera peltata +
Illustrated  +, Endemic  +
Dasiphora fruticosa +
Illustrated  +
Dasistoma +
Endemic  +
Dasistoma macrophyllum +
Illustrated  +, Endemic  +
Dasylirion texanum +
Illustrated  +
Dasylirion wheeleri +
Illustrated  +
Datisca glomerata +
Illustrated  +
Decumaria barbara +
Illustrated  +, Endemic  +
Dedeckera eurekensis +
Illustrated  +, Endemic  +, Conservation concern  +
Deeringothamnus pulchellus +
Conservation concern  +, Endemic  +, Illustrated  +
Deeringothamnus rugelii +
Conservation concern  +, Endemic  +, Illustrated  +
Deinandra arida +
Endemic  +, Conservation concern  +
Deinandra clementina +
Illustrated  +, Endemic  +, Conservation concern  +
Deinandra conjugens +
Conservation concern  +
Deinandra corymbosa +
Endemic  +
Deinandra floribunda +
Conservation concern  +
Deinandra halliana +
Endemic  +, Conservation concern  +
Deinandra increscens +
Illustrated  +, Endemic  +
Deinandra increscens subsp. increscens +
Illustrated  +, Endemic  +
Deinandra increscens subsp. villosa +
Endemic  +, Conservation concern  +
Deinandra lobbii +
Endemic  +
Deinandra minthornii +
Endemic  +, Conservation concern  +
Deinandra mohavensis +
Endemic  +, Conservation concern  +
Deinandra pallida +
Endemic  +
Deinandra paniculata +
Conservation concern  +
Deinandra pentactis +
Endemic  +
Deiregyne confusa +
Illustrated  +
Delairea odorata +
Introduced  +, Illustrated  +
Delosperma litorale +
Introduced  +, Illustrated  +
Delphinium alabamicum +
Conservation concern  +, Endemic  +
Delphinium alpestre +
Conservation concern  +, Endemic  +
Delphinium andersonii +
Endemic  +, Illustrated  +
Delphinium andesicola +
Endemic  +
Delphinium antoninum +
Conservation concern  +, Endemic  +
Delphinium bakeri +
Conservation concern  +, Endemic  +
Delphinium barbeyi +
W2  +, Endemic  +, Illustrated  +
Delphinium basalticum +
Conservation concern  +, Endemic  +
Delphinium bicolor +
W2  +, Illustrated  +, Endemic  +
Delphinium bicolor subsp. bicolor +
Endemic  +, Illustrated  +
Delphinium bicolor subsp. calcicola +
Endemic  +
Delphinium californicum +
Endemic  +
Delphinium californicum subsp. californicum +
Endemic  +
Delphinium californicum subsp. interius +
Conservation concern  +, Endemic  +
Delphinium carolinianum +
Illustrated  +
Delphinium carolinianum subsp. calciphilum +
Endemic  +
Delphinium carolinianum subsp. carolinianum +
Endemic  +, Illustrated  +
Delphinium carolinianum subsp. vimineum +
Illustrated  +
Delphinium carolinianum subsp. virescens +
Endemic  +, Weedy  +
Delphinium decorum +
Endemic  +
Delphinium decorum subsp. decorum +
Endemic  +
Delphinium decorum subsp. tracyi +
Endemic  +
Delphinium depauperatum +
Endemic  +
Delphinium distichum +
Endemic  +, Illustrated  +
Delphinium elatum +
Introduced  +
Delphinium exaltatum +
Endemic  +, Illustrated  +
Delphinium geraniifolium +
Endemic  +
Delphinium geyeri +
Endemic  +, Illustrated  +, Weedy  +
Delphinium glareosum +
Endemic  +, Illustrated  +
Delphinium glaucescens +
Endemic  +
Delphinium glaucum +
W2  +, Endemic  +, Illustrated  +
Delphinium gracilentum +
Endemic  +
Delphinium gypsophilum +
Endemic  +
Delphinium gypsophilum subsp. gypsophilum +
Endemic  +
Delphinium gypsophilum subsp. parviflorum +
Conservation concern  +, Endemic  +
Delphinium hansenii +
Illustrated  +, Endemic  +
Delphinium hansenii subsp. ewanianum +
Conservation concern  +, Endemic  +
Delphinium hansenii subsp. hansenii +
Endemic  +, Illustrated  +
Delphinium hansenii subsp. kernense +
Endemic  +
Delphinium hesperium +
Endemic  +
Delphinium hesperium subsp. cuyamacae +
Conservation concern  +, Endemic  +
Delphinium hesperium subsp. hesperium +
Endemic  +
Delphinium hesperium subsp. pallescens +
Endemic  +
Delphinium hutchinsoniae +
Conservation concern  +, Endemic  +
Delphinium inopinum +
Endemic  +
Delphinium lineapetalum +
Conservation concern  +, Endemic  +, Illustrated  +
Delphinium luteum +
Conservation concern  +, Endemic  +
Delphinium madrense +
Illustrated  +
Delphinium menziesii +
W2  +, Illustrated  +, Endemic  +
Delphinium menziesii subsp. menziesii +
Endemic  +, Illustrated  +
Delphinium menziesii subsp. pallidum +
Endemic  +
Delphinium multiplex +
Endemic  +
Delphinium newtonianum +
Endemic  +, Illustrated  +
Delphinium novomexicanum +
Endemic  +
Delphinium nudicaule +
Endemic  +, Illustrated  +
Delphinium nuttallianum +
W2  +, Endemic  +
Delphinium nuttallii +
Endemic  +
Delphinium nuttallii subsp. nuttallii +
Endemic  +
Delphinium nuttallii subsp. ochroleucum +
Conservation concern  +, Endemic  +
Delphinium parishii subsp. pallidum +
Endemic  +
Delphinium parryi +
Illustrated  +
Delphinium parryi subsp. blochmaniae +
Conservation concern  +, Endemic  +, Illustrated  +
Delphinium parryi subsp. eastwoodiae +
Conservation concern  +, Endemic  +
Delphinium parryi subsp. maritimum +
Illustrated  +
Delphinium parryi subsp. parryi +
Illustrated  +
Delphinium parryi subsp. purpureum +
Conservation concern  +, Endemic  +
Delphinium patens +
Endemic  +
Delphinium patens subsp. hepaticoideum +
Endemic  +
Delphinium patens subsp. montanum +
Endemic  +
Delphinium patens subsp. patens +
Endemic  +
Delphinium polycladon +
Endemic  +
Delphinium purpusii +
Conservation concern  +, Endemic  +
Delphinium ramosum +
Endemic  +
Delphinium recurvatum +
Conservation concern  +, Endemic  +
Delphinium robustum +
Conservation concern  +, Endemic  +, Illustrated  +
Delphinium sapellonis +
Endemic  +
Delphinium scaposum +
Endemic  +, Illustrated  +
Delphinium scopulorum +
Illustrated  +
Delphinium stachydeum +
Endemic  +, Illustrated  +
Delphinium sutherlandii +
Endemic  +
Delphinium treleasei +
Endemic  +, Illustrated  +
Delphinium tricorne +
Endemic  +, Illustrated  +
Delphinium trolliifolium +
Endemic  +
Delphinium uliginosum +
Endemic  +, Illustrated  +
Delphinium umbraculorum +
Endemic  +
Delphinium variegatum +
Illustrated  +, Endemic  +
Delphinium variegatum subsp. kinkiense +
Conservation concern  +, Endemic  +
Delphinium variegatum subsp. thornei +
Conservation concern  +, Endemic  +
Delphinium variegatum subsp. variegatum +
Endemic  +, Illustrated  +
Delphinium viridescens +
Conservation concern  +, Endemic  +, Illustrated  +
Delphinium wootonii +
Illustrated  +
Delphinium xantholeucum +
Conservation concern  +, Endemic  +, Illustrated  +
Dendroalsia abietina +
Illustrated  +
Dendromecon harfordii +
Endemic  +
Dendromecon rigida +
Illustrated  +
Dendrophylax lindenii +
Illustrated  +
Dennstaedtia punctilobula +
Illustrated  +, Endemic  +
Deparia acrostichoides +
Illustrated  +, Endemic  +
Deparia petersenii +
Introduced  +
Deschampsia mackenzieana +
Endemic  +
Descurainia californica +
Illustrated  +, Endemic  +
Descurainia incana +
Illustrated  +, Endemic  +
Descurainia paradisa +
Endemic  +
Descurainia pinnata subsp. brachycarpa +
Endemic  +
Descurainia sophia +
Weedy  +, Introduced  +
Descurainia torulosa +
Endemic  +, Conservation concern  +
Deutzia +
Introduced  +
Deutzia gracilis +
Introduced  +, Illustrated  +
Deutzia parviflora +
Introduced  +
Deutzia scabra +
Introduced  +
Diamorpha smallii +
Illustrated  +, Endemic  +
Dianella ensifolia +
Introduced  +, Illustrated  +
Dianthus armeria +
Weedy  +, Introduced  +
Dianthus armeria subsp. armeria +
Weedy  +, Introduced  +
Dianthus barbatus +
Introduced  +, Illustrated  +
Dianthus barbatus subsp. barbatus +
Introduced  +, Illustrated  +
Dianthus carthusianorum +
Introduced  +
Dianthus deltoides +
Introduced  +, Illustrated  +
Dianthus deltoides subsp. deltoides +
Introduced  +, Illustrated  +
Dianthus plumarius +
Introduced  +
Dianthus plumarius subsp. plumarius +
Introduced  +
Diapensia lapponica +
Illustrated  +
Diaperia candida +
Endemic  +
Diaperia prolifera +
Illustrated  +, Endemic  +
Diaperia prolifera var. barnebyi +
Illustrated  +, Endemic  +
Diaperia prolifera var. prolifera +
Illustrated  +, Endemic  +
Diaperia verna +
Weedy  +
Diaperia verna var. drummondii +
Endemic  +
Diaperia verna var. verna +
Weedy  +
Diarrhena americana +
Endemic  +
Dicentra canadensis +
Endemic  +
Dicentra cucullaria +
Endemic  +, Illustrated  +
Dicentra eximia +
Endemic  +
Dicentra formosa +
Illustrated  +, Endemic  +
Dicentra formosa subsp. formosa +
Endemic  +, Illustrated  +
Dicentra formosa subsp. oregana +
Endemic  +
Dicentra nevadensis +
Conservation concern  +, Endemic  +
Dicentra ochroleuca +
Endemic  +
Dicentra pauciflora +
Endemic  +
Dicentra uniflora +
Endemic  +, Illustrated  +
Dichaetophora campestris +
Illustrated  +
Dichanthelium boreale +
Endemic  +
Dichanthelium boscii +
Endemic  +
Dichanthelium clandestinum +
Endemic  +
Dichanthelium consanguineum +
Endemic  +
Dichanthelium depauperatum +
Endemic  +
Dichanthelium latifolium +
Endemic  +
Dichanthelium leibergii +
Endemic  +
Dichanthelium linearifolium +
Endemic  +
Dichanthelium malacophyllum +
Endemic  +
Dichanthelium ravenelii +
Endemic  +
Dichanthelium scabriusculum +
Endemic  +
Dichanthelium wilcoxianum +
Endemic  +
Dichanthium annulatum +
Introduced  +
Dichanthium aristatum +
Introduced  +
Dichanthium sericeum +
Introduced  +
Dichelostemma capitatum +
Illustrated  +
Dichelostemma capitatum subsp. capitatum +
Illustrated  +
Dichelostemma capitatum subsp. pauciflorum +
Illustrated  +
Dichelostemma congestum +
Endemic  +
Dichelostemma ida-maia +
Illustrated  +, Endemic  +
Dichelostemma multiflorum +
Illustrated  +, Endemic  +
Dichelostemma volubile +
Endemic  +
Dichelyma capillaceum +
Illustrated  +
Dichelyma pallescens +
Endemic  +
Dichelyma uncinatum +
Endemic  +
Dichromanthus cinnabarinus +
Illustrated  +
Dicoria canescens +
Illustrated  +
Dicranocarpus parviflorus +
Illustrated  +
Dicranopteris flexuosa +
Illustrated  +
Dicranostegia orcuttiana +
Illustrated  +, Conservation concern  +
Dieteria asteroides var. glandulosa +
Endemic  +
Dieteria bigelovii +
Illustrated  +, Endemic  +
Dieteria bigelovii var. bigelovii +
Illustrated  +, Endemic  +
Dieteria bigelovii var. commixta +
Endemic  +
Dieteria bigelovii var. mucronata +
Endemic  +
Dieteria canescens +
Illustrated  +
Dieteria canescens var. ambigua +
Endemic  +
Dieteria canescens var. aristata +
Endemic  +
Dieteria canescens var. canescens +
Endemic  +
Dieteria canescens var. glabra +
Illustrated  +
Dieteria canescens var. incana +
Endemic  +
Dieteria canescens var. leucanthemifolia +
Endemic  +
Dieteria canescens var. nebraskana +
Endemic  +
Dieteria canescens var. sessiliflora +
Endemic  +
Dieteria canescens var. shastensis +
Endemic  +
Dieteria canescens var. ziegleri +
Endemic  +
Digitalis +
Introduced  +
Digitalis grandiflora +
Introduced  +
Digitalis lanata +
Introduced  +
Digitalis lutea +
Introduced  +
Digitalis purpurea +
Weedy  +, Introduced  +, Illustrated  +
Digitalis purpurea subsp. purpurea +
Weedy  +, Introduced  +, Illustrated  +
Digitaria eriantha +
Introduced  +
Digitaria eriantha subsp. eriantha +
Introduced  +
Digitaria eriantha subsp. pentzii +
Introduced  +
Digitaria filiformis var. dolichophylla +
Endemic  +
Digitaria floridana +
Endemic  +
Digitaria gracillima +
Endemic  +
Digitaria horizontalis +
Introduced  +
Digitaria ischaemum +
Introduced  +
Digitaria longiflora +
Introduced  +
Digitaria milanjiana +
Introduced  +
Digitaria nuda +
Introduced  +
Digitaria pauciflora +
Endemic  +
Digitaria sanguinalis +
Introduced  +
Digitaria serotina +
Endemic  +
Digitaria setigera +
Introduced  +
Digitaria simpsonii +
Endemic  +
Digitaria texana +
Endemic  +
Digitaria violascens +
Introduced  +
Dimeresia howellii +
Illustrated  +, Endemic  +
Dimorphocarpa wislizeni +
Illustrated  +
Dimorphotheca pluvialis +
Introduced  +
Dimorphotheca sinuata +
Introduced  +, Illustrated  +
Dionaea muscipula +
Endemic  +, Illustrated  +
Dioscorea alata +
Introduced  +
Dioscorea bulbifera +
W1  +, Introduced  +
Dioscorea floridana +
Illustrated  +, Endemic  +
Dioscorea polystachya +
Introduced  +, Illustrated  +
Dioscorea sansibarensis +
Introduced  +
Dioscorea villosa +
Illustrated  +, Endemic  +
Diospyros ebenum +
Introduced  +
Diospyros texana +
Illustrated  +
Diospyros virginiana +
Illustrated  +, Endemic  +
Diphasiastrum complanatum +
Illustrated  +
Diphylleia cymosa +
Endemic  +, Illustrated  +
Diplacus angustatus +
Endemic  +
Diplacus aridus +
Endemic  +
Diplacus aurantiacus +
Endemic  +
Diplacus bicolor +
Endemic  +
Diplacus bigelovii +
Endemic  +
Diplacus bigelovii var. bigelovii +
Endemic  +
Diplacus bigelovii var. cuspidatus +
Endemic  +
Diplacus bolanderi +
Endemic  +
Diplacus brandegeei +
Conservation concern  +
Diplacus calycinus +
Endemic  +
Diplacus cascadensis +
Endemic  +
Diplacus clivicola +
Endemic  +
Diplacus compactus +
Endemic  +
Diplacus congdonii +
Endemic  +
Diplacus constrictus +
Endemic  +
Diplacus cusickii +
Illustrated  +, Endemic  +
Diplacus cusickioides +
Endemic  +
Diplacus deschutesensis +
Endemic  +
Diplacus douglasii +
Endemic  +
Diplacus fremontii +
Illustrated  +
Diplacus grandiflorus +
Endemic  +
Diplacus graniticola +
Endemic  +
Diplacus jepsonii +
Endemic  +
Diplacus johnstonii +
Endemic  +
Diplacus kelloggii +
Illustrated  +, Endemic  +
Diplacus layneae +
Illustrated  +, Endemic  +
Diplacus leptaleus +
Endemic  +
Diplacus linearis +
Endemic  +
Diplacus longiflorus +
Illustrated  +
Diplacus mephiticus +
Endemic  +
Diplacus mohavensis +
Endemic  +, Conservation concern  +
Diplacus nanus +
Endemic  +
Diplacus ovatus +
Endemic  +, Conservation concern  +
Diplacus parryi +
Illustrated  +, Endemic  +
Diplacus parviflorus +
Endemic  +
Diplacus pictus +
Endemic  +, Conservation concern  +
Diplacus pulchellus +
Endemic  +
Diplacus pygmaeus +
Endemic  +
Diplacus rattanii +
Endemic  +
Diplacus rupicola +
Endemic  +
Diplacus rutilus +
Endemic  +
Diplacus thompsonii +
Illustrated  +, Endemic  +
Diplacus torreyi +
Illustrated  +, Endemic  +
Diplacus traskiae +
Endemic  +
Diplacus tricolor +
Endemic  +
Diplacus vandenbergensis +
Endemic  +
Diplacus viscidus +
Endemic  +
Diplazium esculentum +
Introduced  +
Diplazium pycnocarpon +
Illustrated  +, Endemic  +
Diplotaxis erucoides +
Introduced  +
Diplotaxis muralis +
Weedy  +, Introduced  +, Illustrated  +
Diplotaxis tenuifolia +
Weedy  +, Introduced  +
Dirca decipiens +
Endemic  +
Dirca occidentalis +
Endemic  +
Dirca palustris +
Endemic  +, Illustrated  +
Dithyrea californica +
Illustrated  +
Dithyrea maritima +
Conservation concern  +
Ditrysinia +
Endemic  +
Ditrysinia fruticosa +
Illustrated  +, Endemic  +
Dittrichia graveolens +
Introduced  +, Illustrated  +
Dodecahema leptoceras +
Illustrated  +, Endemic  +, Conservation concern  +
Dodecatheon alpinum +
Endemic  +
Dodecatheon amethystinum +
Endemic  +
Dodecatheon clevelandii +
Conservation concern  +
Dodecatheon clevelandii var. clevelandii +
Conservation concern  +
Dodecatheon clevelandii var. gracile +
Conservation concern  +
Dodecatheon clevelandii var. insulare +
Conservation concern  +
Dodecatheon clevelandii var. patulum +
Conservation concern  +
Dodecatheon conjugens +
Endemic  +
Dodecatheon conjugens var. conjugens +
Endemic  +
Dodecatheon conjugens var. viscidum +
Endemic  +
Dodecatheon dentatum +
Endemic  +
Dodecatheon hendersonii +
Endemic  +
Dodecatheon jeffreyi +
Endemic  +
Dodecatheon meadia +
Illustrated  +, Endemic  +
Dodecatheon poeticum +
Endemic  +
Dodecatheon pulchellum +
Illustrated  +
Dodecatheon pulchellum var. cusickii +
Illustrated  +
Dodecatheon pulchellum var. distolum +
Illustrated  +
Dodecatheon pulchellum var. macrocarpum +
Illustrated  +
Dodecatheon pulchellum var. monanthum +
Endemic  +
Dodecatheon pulchellum var. pulchellum +
Illustrated  +
Dodecatheon pulchellum var. shoshonense +
Illustrated  +
Dodecatheon pulchellum var. zionense +
Endemic  +
Dodecatheon redolens +
Illustrated  +, Endemic  +
Dodecatheon subalpinum +
Endemic  +
Doellingeria infirma +
Endemic  +
Doellingeria sericocarpoides +
Endemic  +
Doellingeria umbellata +
Illustrated  +, Endemic  +
Doellingeria umbellata var. pubens +
Endemic  +
Doellingeria umbellata var. umbellata +
Illustrated  +, Endemic  +
Donnellia commutata +
Illustrated  +
Donrichardsia macroneuron +
Endemic  +, Illustrated  +
Dopatrium +
Introduced  +
Dopatrium junceum +
Weedy  +, Introduced  +, Illustrated  +
Doronicum orientale +
Introduced  +
Doronicum pardalianches +
Introduced  +, Illustrated  +
Dorstenia contrajerva +
Illustrated  +, Introduced  +
Douglasia alaskana +
Endemic  +
Douglasia arctica +
Endemic  +
Douglasia beringensis +
Illustrated  +, Endemic  +, Conservation concern  +
Douglasia gormanii +
Endemic  +
Douglasia idahoensis +
Endemic  +
Douglasia laevigata +
Endemic  +
Douglasia montana +
Endemic  +
Douglasia nivalis +
Endemic  +
Draba albertina +
Endemic  +
Draba aleutica +
Illustrated  +, Conservation concern  +
Draba aprica +
Endemic  +
Draba arabisans +
Endemic  +
Draba arctogena +
Endemic  +
Draba argyrea +
Endemic  +
Draba arida +
Endemic  +, Conservation concern  +
Draba asprella +
Illustrated  +, Endemic  +
Draba asprella var. asprella +
Illustrated  +, Endemic  +
Draba asprella var. stelligera +
Endemic  +, Conservation concern  +
Draba aurea +
Endemic  +
Draba aureola +
Illustrated  +, Endemic  +
Draba brachycarpa +
Endemic  +
Draba breweri +
Endemic  +
Draba californica +
Endemic  +
Draba cana +
Endemic  +
Draba carnosula +
Illustrated  +, Endemic  +, Conservation concern  +
Draba corrugata +
Illustrated  +, Endemic  +, Conservation concern  +
Draba crassa +
Endemic  +
Draba cruciata +
Endemic  +, Conservation concern  +
Draba cusickii +
Endemic  +
Draba densifolia +
Illustrated  +, Endemic  +
Draba exunguiculata +
Endemic  +, Conservation concern  +
Draba graminea +
Endemic  +, Conservation concern  +
Draba grayana +
Endemic  +, Conservation concern  +
Draba hitchcockii +
Illustrated  +, Endemic  +
Draba howellii +
Endemic  +
Draba incerta +
Endemic  +
Draba incrassata +
Endemic  +
Draba jaegeri +
Endemic  +, Conservation concern  +
Draba kassii +
Endemic  +, Conservation concern  +
Draba kluanei +
Endemic  +, Conservation concern  +
Draba lemmonii +
Endemic  +
Draba longisquamosa +
Endemic  +
Draba macounii +
Endemic  +
Draba maguirei +
Endemic  +
Draba monoensis +
Endemic  +, Conservation concern  +
Draba murrayi +
Endemic  +, Conservation concern  +
Draba nemorosa +
Weedy  +, Introduced  +
Draba novolympica +
Endemic  +
Draba ogilviensis +
Endemic  +
Draba oligosperma +
Illustrated  +, Endemic  +
Draba oreibata +
Endemic  +
Draba paucifructa +
Illustrated  +, Endemic  +, Conservation concern  +
Draba paysonii +
Endemic  +
Draba pennellii +
Endemic  +, Conservation concern  +
Draba platycarpa +
Illustrated  +, Endemic  +
Draba porsildii +
Endemic  +
Draba pterosperma +
Endemic  +
Draba ramosissima +
Endemic  +
Draba ramulosa +
Endemic  +, Conservation concern  +
Draba reptans +
Endemic  +
Draba ruaxes +
Endemic  +
Draba scotteri +
Endemic  +, Conservation concern  +
Draba sharsmithii +
Illustrated  +, Endemic  +, Conservation concern  +
Draba sierrae +
Endemic  +, Conservation concern  +
Draba sphaerocarpa +
Endemic  +
Draba sphaeroides +
Endemic  +, Conservation concern  +
Draba standleyi +
Endemic  +, Conservation concern  +
Draba stenoloba +
Endemic  +
Draba streptobrachia +
Endemic  +
Draba streptocarpa +
Illustrated  +, Endemic  +
Draba subalpina +
Endemic  +
Draba subumbellata +
Illustrated  +, Endemic  +
Draba trichocarpa +
Endemic  +, Conservation concern  +
Draba ventosa +
Endemic  +
Draba verna +
Weedy  +, Introduced  +
Draba yukonensis +
Illustrated  +, Endemic  +, Conservation concern  +
Draba zionensis +
Endemic  +
Drepanocladus aduncus +
Illustrated  +
Drepanocladus arcticus +
Illustrated  +
Drepanocladus cardotii +
Endemic  +
Drepanocladus polygamus +
Illustrated  +
Drepanocladus sordidus +
Illustrated  +
Drosanthemum floribundum +
Introduced  +, Illustrated  +
Drosera filiformis +
Endemic  +
Drosera intermedia +
Illustrated  +
Drosera linearis +
Endemic  +
Drosera tracyi +
Endemic  +
Drummondia prorepens +
Endemic  +, Illustrated  +
Dryas ajanensis +
Illustrated  +
Dryas ajanensis subsp. beringensis +
Illustrated  +
Dryas drummondii +
Endemic  +
Dryas hookeriana +
Endemic  +
Dryas integrifolia +
Illustrated  +
Dryas integrifolia subsp. integrifolia +
Illustrated  +
Dryas integrifolia subsp. sylvatica +
Illustrated  +
Dryas octopetala +
Endemic  +
Drymaria cordata +
Weedy  +, Introduced  +, Illustrated  +
Drymaria cordata var. cordata +
Weedy  +, Introduced  +, Illustrated  +
Drymaria molluginea +
Illustrated  +
Drymocallis arguta +
Endemic  +
Drymocallis arizonica +
Endemic  +
Drymocallis ashlandica +
Endemic  +
Drymocallis campanulata +
Endemic  +
Drymocallis convallaria +
Endemic  +
Drymocallis cuneifolia +
Conservation concern  +, Endemic  +, Illustrated  +
Drymocallis cuneifolia var. cuneifolia +
Conservation concern  +, Endemic  +, Illustrated  +
Drymocallis cuneifolia var. ewanii +
Conservation concern  +, Endemic  +, Illustrated  +
Drymocallis deseretica +
Endemic  +
Drymocallis fissa +
Endemic  +, Illustrated  +
Drymocallis glabrata +
Endemic  +
Drymocallis glandulosa +
Illustrated  +
Drymocallis glandulosa var. glandulosa +
Illustrated  +
Drymocallis glandulosa var. reflexa +
Illustrated  +
Drymocallis glandulosa var. viscida +
Endemic  +, Illustrated  +
Drymocallis glandulosa var. wrangelliana +
Illustrated  +
Drymocallis hansenii +
Endemic  +
Drymocallis lactea +
Endemic  +
Drymocallis lactea var. austiniae +
Endemic  +
Drymocallis lactea var. lactea +
Endemic  +
Drymocallis micropetala +
Endemic  +
Drymocallis pseudorupestris +
Endemic  +
Drymocallis pseudorupestris var. crumiana +
Endemic  +
Drymocallis pseudorupestris var. pseudorupestris +
Endemic  +
Drymocallis pseudorupestris var. saxicola +
Endemic  +
Drymocallis rhomboidea +
Endemic  +, Illustrated  +
Dryopetalon runcinatum +
Illustrated  +
Dryopteris campyloptera +
Endemic  +
Dryopteris celsa +
Endemic  +
Dryopteris clintoniana +
Endemic  +
Dryopteris cristata +
Illustrated  +
Dryopteris fragrans +
Illustrated  +
Dryopteris intermedia +
Illustrated  +, Endemic  +
Dryopteris ludoviciana +
Endemic  +
Dryopteris marginalis +
Illustrated  +, Endemic  +
Drypetes lateriflora +
Illustrated  +
Duchesnea +
Introduced  +
Duchesnea indica +
Illustrated  +, Introduced  +
Duchesnea indica var. indica +
Illustrated  +, Introduced  +
Dudleya abramsii subsp. abramsii +
Conservation concern  +
Dudleya abramsii subsp. affinis +
Endemic  +, Conservation concern  +
Dudleya abramsii subsp. bettinae +
Endemic  +, Conservation concern  +
Dudleya abramsii subsp. calcicola +
Endemic  +
Dudleya abramsii subsp. murina +
Endemic  +, Conservation concern  +
Dudleya blochmaniae +
Conservation concern  +
Dudleya blochmaniae subsp. blochmaniae +
Conservation concern  +
Dudleya blochmaniae subsp. insularis +
Endemic  +, Conservation concern  +
Dudleya brevifolia +
Endemic  +, Conservation concern  +
Dudleya candelabrum +
Illustrated  +, Endemic  +, Conservation concern  +
Dudleya cespitosa +
Endemic  +
Dudleya cymosa +
Illustrated  +, Endemic  +
Dudleya cymosa subsp. agourensis +
Endemic  +, Conservation concern  +
Dudleya cymosa subsp. crebrifolia +
Illustrated  +, Endemic  +
Dudleya cymosa subsp. cymosa +
Illustrated  +, Endemic  +
Dudleya cymosa subsp. gigantea +
Endemic  +
Dudleya cymosa subsp. marcescens +
Endemic  +, Conservation concern  +
Dudleya cymosa subsp. ovatifolia +
Endemic  +, Conservation concern  +
Dudleya cymosa subsp. paniculata +
Endemic  +
Dudleya cymosa subsp. pumila +
Endemic  +
Dudleya densiflora +
Illustrated  +, Endemic  +, Conservation concern  +
Dudleya edulis +
Illustrated  +
Dudleya farinosa +
Endemic  +
Dudleya greenei +
Endemic  +
Dudleya multicaulis +
Endemic  +, Conservation concern  +
Dudleya nesiotica +
Endemic  +, Conservation concern  +
Dudleya palmeri +
Endemic  +
Dudleya parva +
Endemic  +, Conservation concern  +
Dudleya saxosa +
Endemic  +
Dudleya saxosa subsp. aloides +
Endemic  +
Dudleya saxosa subsp. collomiae +
Endemic  +
Dudleya saxosa subsp. saxosa +
Endemic  +
Dudleya stolonifera +
Endemic  +, Conservation concern  +
Dudleya traskiae +
Endemic  +, Conservation concern  +
Dudleya variegata +
Illustrated  +, Conservation concern  +
Dudleya verityi +
Endemic  +, Conservation concern  +
Dudleya virens +
Conservation concern  +
Dudleya virens subsp. hassei +
Conservation concern  +
Dudleya virens subsp. insularis +
Conservation concern  +
Dudleya virens subsp. virens +
Conservation concern  +
Dudleya viscida +
Endemic  +, Conservation concern  +
Dulichium arundinaceum +
Illustrated  +, Endemic  +
Dulichium arundinaceum var. arundinaceum +
Illustrated  +, Endemic  +
Dulichium arundinaceum var. boreale +
Illustrated  +, Endemic  +
Dypsis lutescens +
Introduced  +, Illustrated  +
Dysodiopsis tagetoides +
Illustrated  +, Endemic  +
Dysphania ambrosioides +
Weedy  +, Illustrated  +
Dysphania aristata +
Introduced  +
Dysphania botrys +
Weedy  +, Introduced  +, Illustrated  +
Dysphania carinata +
Introduced  +
Dysphania chilensis +
Introduced  +, Illustrated  +
Dysphania cristata +
Introduced  +
Dysphania graveolens +
Illustrated  +
Dysphania multifida +
Introduced  +, Illustrated  +
Dysphania pumilio +
Introduced  +, Illustrated  +
Dyssodia papposa +
Illustrated  +
E
Eastwoodia elegans +
Illustrated  +, Endemic  +
Eatonella nivea +
Illustrated  +, Endemic  +
Ecballium +
Introduced  +
Ecballium elaterium +
Illustrated  +, Introduced  +
Echeandia flavescens +
Illustrated  +
Echeveria strictiflora +
Illustrated  +
Echinacea angustifolia +
Endemic  +
Echinacea atrorubens +
Endemic  +
Echinacea laevigata +
Endemic  +, Conservation concern  +
Echinacea pallida +
Illustrated  +, Endemic  +
Echinacea paradoxa +
Endemic  +, Conservation concern  +
Echinacea paradoxa var. neglecta +
Endemic  +, Conservation concern  +
Echinacea paradoxa var. paradoxa +
Endemic  +, Conservation concern  +
Echinacea purpurea +
Illustrated  +, Endemic  +
Echinacea sanguinea +
Endemic  +
Echinacea simulata +
Endemic  +
Echinacea tennesseensis +
Endemic  +, Conservation concern  +
Echinocactus horizonthalonius +
Illustrated  +
Echinocactus polycephalus var. xeranthemoides +
Endemic  +
Echinocereus arizonicus +
Illustrated  +
Echinocereus bonkerae +
Endemic  +
Echinocereus chisosensis +
Endemic  +, Conservation concern  +
Echinocereus davisii +
Illustrated  +, Endemic  +
Echinocereus fasciculatus +
Illustrated  +
Echinocereus pentalophus +
Illustrated  +
Echinocereus poselgeri +
Illustrated  +
Echinocereus reichenbachii +
Conservation concern  +
Echinocereus rigidissimus +
Illustrated  +
Echinocereus rigidissimus var. rigidissimus +
Illustrated  +
Echinocereus triglochidiatus +
Endemic  +
Echinocereus viridiflorus +
Illustrated  +
Echinochloa colona +
Introduced  +
Echinochloa crus-galli +
Introduced  +
Echinochloa frumentacea +
Introduced  +
Echinochloa muricata var. microstachya +
Endemic  +
Echinochloa oryzoides +
Introduced  +
Echinochloa paludigena +
Endemic  +
Echinocystis +
Endemic  +
Echinocystis lobata +
Endemic  +, Illustrated  +
Echinodorus cordifolius +
Illustrated  +
Echinodorus cordifolius subsp. cordifolius +
Illustrated  +
Echinodorus floridanus +
Endemic  +, Conservation concern  +
Echinomastus intertextus +
Illustrated  +
Echinomastus intertextus var. dasyacanthus +
Endemic  +
Echinomastus intertextus var. intertextus +
Illustrated  +
Echinomastus johnsonii +
Illustrated  +, Endemic  +
Echinomastus mariposensis +
Conservation concern  +
Echinomastus warnockii +
Endemic  +
Echinopepon wrightii +
Illustrated  +
Echinophyllum sachalinense +
Illustrated  +
Echinops exaltatus +
Introduced  +, Illustrated  +
Echinops ritro subsp. ruthenicus +
Introduced  +
Echinops sphaerocephalus +
Introduced  +
Eclipta prostrata +
Illustrated  +
Edgeworthia +
Introduced  +
Edgeworthia gardneri +
Illustrated  +, Introduced  +
Egeria densa +
Weedy  +, Introduced  +, Illustrated  +
Egletes viscosa +
Illustrated  +
Ehrharta calycina +
Introduced  +
Ehrharta erecta +
Introduced  +
Eichhornia azurea +
W2  +, W1  +, Introduced  +
Eichhornia crassipes +
W2  +, W1  +, Introduced  +, …
Elaeis guineensis +
Introduced  +, Illustrated  +
Elatine ambigua +
Weedy  +, Introduced  +
Elatine americana +
Endemic  +
Elatine chilensis +
Weedy  +
Elatine heterandra +
Endemic  +
Elatine minima +
Endemic  +
Elatine ojibwayensis +
Endemic  +, Conservation concern  +
Elatine rubella +
Illustrated  +, Endemic  +
Elatine triandra +
Introduced  +, Illustrated  +
Eleocharis acicularis +
W2  +, W1  +, Illustrated  +
Eleocharis albida +
Illustrated  +
Eleocharis ambigens +
Illustrated  +
Eleocharis atropurpurea +
Illustrated  +
Eleocharis baldwinii +
W1  +, Illustrated  +, Endemic  +
Eleocharis bella +
Illustrated  +
Eleocharis bernardina +
Endemic  +, Conservation concern  +
Eleocharis bicolor +
Illustrated  +, Conservation concern  +
Eleocharis bolanderi +
Illustrated  +, Endemic  +
Eleocharis brachycarpa +
Illustrated  +, Conservation concern  +
Eleocharis brittonii +
Illustrated  +, Endemic  +
Eleocharis cellulosa +
W1  +, Illustrated  +
Eleocharis coloradoensis +
Illustrated  +
Eleocharis compressa +
Illustrated  +, Endemic  +
Eleocharis compressa var. acutisquamata +
Illustrated  +, Endemic  +
Eleocharis compressa var. compressa +
Illustrated  +, Endemic  +
Eleocharis cylindrica +
Illustrated  +, Conservation concern  +
Eleocharis decumbens +
Illustrated  +, Endemic  +
Eleocharis diandra +
Illustrated  +, Endemic  +, Conservation concern  +
Eleocharis elliptica +
Illustrated  +, Endemic  +
Eleocharis elongata +
Illustrated  +
Eleocharis engelmannii +
Illustrated  +, Endemic  +
Eleocharis equisetoides +
Illustrated  +, Endemic  +
Eleocharis erythropoda +
Illustrated  +, Endemic  +
Eleocharis fallax +
Illustrated  +, Endemic  +, Conservation concern  +
Eleocharis flavescens +
Illustrated  +
Eleocharis flavescens var. flavescens +
Illustrated  +
Eleocharis flavescens var. olivacea +
Illustrated  +, Endemic  +
Eleocharis geniculata +
Illustrated  +
Eleocharis intermedia +
Illustrated  +, Endemic  +
Eleocharis interstincta +
Illustrated  +
Eleocharis kamtschatica +
Illustrated  +
Eleocharis lanceolata +
Illustrated  +, Endemic  +
Eleocharis macrostachya +
Illustrated  +
Eleocharis mamillata +
Illustrated  +
Eleocharis mamillata subsp. mamillata +
Illustrated  +
Eleocharis melanocarpa +
Illustrated  +, Endemic  +
Eleocharis microcarpa +
Illustrated  +
Eleocharis microcarpa var. filiculmis +
Illustrated  +, Endemic  +
Eleocharis microcarpa var. microcarpa +
Illustrated  +
Eleocharis minima +
Illustrated  +
Eleocharis montana +
Illustrated  +
Eleocharis montevidensis +
Illustrated  +
Eleocharis nana +
Illustrated  +
Eleocharis nigrescens +
Illustrated  +
Eleocharis nitida +
Illustrated  +, Endemic  +
Eleocharis obtusa +
W2  +, W1  +, Illustrated  +
Eleocharis obtusetrigona +
Illustrated  +
Eleocharis ovata +
Illustrated  +
Eleocharis pachycarpa +
Introduced  +, Illustrated  +
Eleocharis palustris +
W2  +, W1  +, Illustrated  +
Eleocharis parishii +
Illustrated  +
Eleocharis parvula +
W1  +, Illustrated  +
Eleocharis quadrangulata +
W1  +, Illustrated  +
Eleocharis quinqueflora +
Illustrated  +
Eleocharis radicans +
Illustrated  +
Eleocharis ravenelii +
Illustrated  +, Conservation concern  +
Eleocharis retroflexa +
Illustrated  +
Eleocharis reverchonii +
Illustrated  +, Endemic  +, Conservation concern  +
Eleocharis robbinsii +
Illustrated  +, Endemic  +
Eleocharis rostellata +
W1  +, Illustrated  +
Eleocharis suksdorfiana +
Illustrated  +, Endemic  +
Eleocharis tenuis +
Illustrated  +, Endemic  +
Eleocharis tenuis var. pseudoptera +
Illustrated  +, Endemic  +
Eleocharis tenuis var. tenuis +
Illustrated  +, Endemic  +
Eleocharis tenuis var. verrucosa +
Illustrated  +, Endemic  +
Eleocharis tortilis +
Illustrated  +, Endemic  +
Eleocharis tricostata +
Illustrated  +, Endemic  +
Eleocharis tuberculosa +
Illustrated  +, Endemic  +
Eleocharis uniglumis +
Illustrated  +
Eleocharis vivipara +
W1  +, Illustrated  +, Endemic  +
Eleocharis wolfii +
Illustrated  +, Endemic  +
Elephantopus elatus +
Endemic  +
Elephantopus nudatus +
Endemic  +
Eleusine coracana +
Introduced  +
Eleusine coracana subsp. africana +
Introduced  +
Eleusine coracana subsp. coracana +
Introduced  +
Eleusine indica +
Introduced  +
Eleusine tristachya +
Introduced  +
Elliottia racemosa +
Endemic  +, Conservation concern  +
Elmera racemosa +
Illustrated  +, Endemic  +
Elodea bifoliata +
Endemic  +
Elodea nuttallii +
Illustrated  +
Elodium blandowii +
Illustrated  +
Elodium elodioides +
Endemic  +
Eltroplectris calcarata +
Illustrated  +
Elymus alaskanus subsp. alaskanus +
Endemic  +
Elymus canadensis var. canadensis +
Endemic  +
Elymus canadensis var. robustus +
Endemic  +
Elymus diversiglumis +
Endemic  +
Elymus elymoides subsp. brevifolius +
Endemic  +
Elymus elymoides subsp. californicus +
Endemic  +
Elymus elymoides subsp. hordeoides +
Endemic  +