View source for Eriogonum ← Eriogonum You do not have permission to edit this page, for the following reason: The action you have requested is limited to users in the group: Users. You can view and copy the source of this page. {{Treatment/ID |accepted_name=Eriogonum |accepted_authority=Michaux |publications={{Treatment/Publication |title=Fl. Bor.-Amer. |place=1: 246, plate 24. 1803 |year=1803 }} |common_names=Wild buckwheat |basionyms= |synonyms= |hierarchy=Polygonaceae;Polygonaceae subfam. Eriogonoideae;Eriogonum |hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Polygonaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Polygonaceae subfam. Eriogonoideae]]</div><div class="higher-taxon"><small>genus</small>[[Eriogonum]]</div></div> |etymology=Greek erion, wool, and gony, knee, alluding to the hairy nodes of the species first described, E. tomentosum |volume=Volume 5 |mention_page=page 216, 218, 219, 220, 222, 223, 361, 431, 435, 437, 443, 444, 445, 446, 472 |treatment_page=page 221 }}<!-- --><span class="statement" id="st-d0_s0" data-properties="whole_organism growth form;whole_organism duration;whole_organism duration;whole_organism duration;whole_organism duration;whole_organism duration;whole_organism reproduction;whole_organism reproduction;whole_organism reproduction;whole_organism reproduction;whole_organism growth form;whole_organism duration;whole_organism duration;whole_organism duration;whole_organism duration;whole_organism duration;whole_organism reproduction;whole_organism reproduction;whole_organism reproduction;whole_organism growth form"><b>Shrubs,</b> subshrubs, or herbs, sometimes nearly arborescent, perennial, biennial, or annual, polycarpic or, rarely, monocarpic (subg. Pterogonum), synoecious (sometimes polygamodioecious in subg. Micrantha and Oligogonum, rarely dioecious in subg. Oligogonum);</span> <span class="statement" id="st-d0_s1" data-properties="taproot size;taproot architecture;taproot architecture;taproot architecture;taproot architecture">taproot slender to stout, solid, or rarely chambered (subg. Pterogonum).</span> <span class="statement" id="st-d0_s2" data-properties="stem growth form or orientation;stem growth form or orientation;stem presence;stem pubescence;stem pubescence;stem architecture or function or pubescence"><b>Stems </b>prostrate or decumbent to erect, infrequently absent, glabrous or pubescent, sometimes glandular;</span> <span class="statement" id="st-d0_s3" data-properties="caudex stem presence;caudex stem texture;caudex stem architecture or arrangement;caudex stem orientation;caudex stem orientation;caudex stem orientation">caudex stems absent or woody, tightly compact to spreading and at or just below surface, or spreading to erect and above surface;</span> <span class="statement" id="st-d0_s4" data-properties="flowering-stem location;flowering-stem orientation;flowering-stem growth form or orientation;flowering-stem growth form or orientation;flowering-stem size;flowering-stem architecture;flowering-stem shape;flowering-stem architecture;branch location;segment shape">aerial flowering-stems arising at nodes of caudex branches, at distal nodes of aerial branches, or directly from the root, prostrate or decumbent to erect, slender to stout, solid or slightly to distinctly hollow and fistulose, rarely disarticulating into ringlike segments (subg. Clastomyelon).</span> <span class="statement" id="st-d0_s5" data-properties="leaf duration;leaf architecture or shape;season life cycle;season duration;season life cycle;season duration;basal leaf length or size;basal leaf condition;basal leaf duration;basal leaf life cycle;basal leaf duration;basal leaf duration;cauline leaf arrangement;cauline leaf arrangement;cauline leaf arrangement;cauline leaf arrangement;cauline leaf arrangement;cauline leaf quantity;cauline leaf architecture or arrangement"><b>Leaves </b>usually persistent through anthesis, occasionally persistent through growing season or longer, sometimes marcescent or quickly deciduous, basal and sometimes sheathing up stems, cauline, or basal and cauline, alternate, opposite, or whorled, 1 per node or fasciculate;</span> <span class="statement" id="st-d0_s6" data-properties="petiole presence;petiole prominence">petiole usually present, sometimes obscure;</span> <span class="statement" id="st-d0_s7" data-properties="blade shape;blade architecture or shape">blade linear to orbiculate, entire apically.</span> <span class="statement" id="st-d0_s8" data-properties="inflorescence position or structure subtype;inflorescence position or structure subtype;inflorescence position;inflorescence architecture;inflorescence architecture;inflorescence arrangement;inflorescence architecture;inflorescence architecture;inflorescence architecture or shape;inflorescence architecture or shape;inflorescence architecture"><b>Inflorescences </b>terminal or terminal and axillary, cymose and dichotomously or trichotomously branched, or racemose, simple or compound-umbellate, subcapitate, or capitate, occasionally distally uniparous due to suppression of secondary branches;</span> <span class="statement" id="st-d0_s9" data-properties="branch architecture;branch fragility;branch architecture;branch shape;branch architecture or pubescence or relief;branch architecture;branch shape;branch shape;branch pubescence;branch pubescence;branch pubescence;branch pubescence;branch pubescence;branch pubescence;branch pubescence;branch pubescence;branch pubescence;branch architecture or function or pubescence;branch relief;initial node architecture">branches mostly dichotomous except for initial trichotomous node, not brittle or disarticulating into segments, round and smooth, rarely grooved, angled or ridged, variously lanate, tomentose, floccose, sericeous, hispid, pilose-pubescent, or puberulent, occasionally glandular, rarely scabrellous;</span> <span class="statement" id="st-d0_s10" data-properties="bract quantity;bract fusion;bract architecture or shape;bract shape;bract shape;bract shape;bract shape;bract architecture;bract pubescence;bract pubescence;bract pubescence;proximal node quantity">bracts 2–13 or more at proximal nodes, usually 3 distally, connate proximally, leaflike, semileaflike, or scalelike, not awn-tipped, glabrous or variously pubescent or glandular.</span> <span class="statement" id="st-d0_s11" data-properties="peduncle presence;peduncle quantity"><b>Peduncles </b>absent or erect to deflexed.</span> <span class="statement" id="st-d0_s12" data-properties="involucre quantity;involucre architecture or pubescence or relief;involucre shape;involucre shape;involucre shape"><b>Involucres </b>1–8 or more per cluster, smooth or ribbed, tubular, cylindric or narrowly turbinate to broadly campanulate or hemispheric;</span> <span class="statement" id="st-d0_s13" data-properties="tooth quantity;tooth architecture;tooth architecture or shape">teeth 5–10, sometimes lobelike, not awned.</span> <span class="statement" id="st-d0_s14" data-properties="flower reproduction;flower reproduction;flower reproduction;flower atypical quantity;flower quantity;time quantity;base shape"><b>Flowers </b>bisexual or, infrequently, unisexual, (2–) 6–100 per involucre at any single time during full anthesis, sometimes with stipelike base;</span> <span class="statement" id="st-d0_s15" data-properties="perianth coloration;perianth shape;perianth shape;perianth pubescence;perianth pubescence;perianth pubescence">perianth usually white to red or variously yellow, broadly campanulate when open, cylindric to urceolate when closed, glabrous or pubescent or glandular abaxially;</span> <span class="statement" id="st-d0_s16" data-properties="tepal quantity;tepal fusion;tepal length;tepal architecture;tepal growth form;tepal architecture or shape;tepal architecture or shape">tepals 6, connate proximally to 1/2 their length, monomorphic or dimorphic, usually entire apically, rarely emarginate;</span> <span class="statement" id="st-d0_s17" data-properties="stamen quantity">stamens 9;</span> <span class="statement" id="st-d0_s18" data-properties="filament fusion;filament pubescence;filament pubescence">filaments adnate basally, glabrous or pubescent;</span> <span class="statement" id="st-d0_s19" data-properties="anther coloration;anther shape">anthers usually red to cream or yellow, oblong to ellipsoid or oval.</span> <span class="statement" id="st-d0_s20" data-properties="achene position;achene variability;achene coloration;achene coloration;achene coloration;achene coloration;achene coloration;achene architecture;achene shape;achene shape;achene shape;achene pubescence;achene pubescence"><b>Achenes </b>included to exserted, various shades of brown, black, or occasionally yellow, rarely winged or ridged (subg. Pterogonum), lenticular or 3-gonous, glabrous or pubescent.</span> <span class="statement" id="st-d0_s21" data-properties=""><b>Seeds:</b> embryo curved or straight.</span> <span class="statement" id="st-d0_s22" data-properties="embryo course;embryo course;x chromosome quantity">x = 10.</span><!-- -->{{Treatment/Body |distribution=North America (including n Mexico) |discussion=<p>Species ca. 250 (224 in the flora).</p><!-- --><p>Eriogonum is the basal group of subfam. Eriogonoideae. Like all of its related genera, Eriogonum is a highly derived tetraploid taxon that has undergone rapid evolution in arid regions of western North America. The circumscription of the genera in the subfamily is now being studied molecularly and cladistically. The approach taken here is to divide the group into numerous genera, acknowledging that the resulting Eriogonum remains paraphyletic and that all genera of Eriogoneae are imbedded within Eriogonum as presently circumscribed. Resolution may well come with the reduction of the subfamily to two genera, Eriogonum and Pterostegia (including Harfordia Greene, a genus of Baja California, Mexico), or, at the other extreme, reducing Eriogonum to just two species. What the future will hold is difficult to ascertain at this time.</p><!-- --><p>As presently circumscribed, Eriogonum is one of the larger genera in the flora area, being exceeded in numbers of species only by Carex (ca. 480), Astragalus (ca. 350), and Penstemon (ca. 250). As a native North American genus, Eriogonum (ca. 250) is second only to Penstemon. Ecologically, species of Eriogonum occur from the seashore to the highest mountains in the United States. They are among the last plants seen atop the Sierra Nevada and on the “outskirts” of Badwater in Death Valley. About one-third of the species are uncommon to rare in their distribution. The United States Department of the Interior currently lists some as endangered or threatened species. Some species tend to be weedy, and some of the annual species are aggressively so.</p><!-- --><p>Species of Eriogonum have long been regarded as among the most difficult in North America to distinguish. Regional treatments should be consulted before attempting to use this review, especially for plants found outside California or the Intermountain West. Geographic distribution is a useful character, and such information is given fully in keys and discussion here to aid with identification. In addition to regional keys noted below, keys exist for Texas (J. L. Reveal 1970b), the Pacific Northwest (J. L. Reveal 1973), and the Great Plains (R. Kaul 1986). In each instance the nomenclature should be compared with that presented here. To aid in the identification of species belonging to the largest subgenus, Eucycla, regional keys are given here, thereby avoiding a long and complex key to the more than 100 species.</p><!-- --><p>In collecting specimens of Eriogonum, try to obtain leaves (especially for annuals), fruits (especially those belonging to subg. Pterogonum), and ample flowers (rarely difficult to accomplish). Field observations on flower color, pubescence, and overall size and habit are useful. Some species (especially those of subg. Oligogonum) are dioecious, with the mature staminate and pistillate plants occasionally markedly different in aspect. It is not uncommon for several annual species to grow intermixed in disturbed places, so care must be taken to prevent mixed collections. Finally, as in all cases, collectors should try to sample the range of variation rather than concentrate on extremes.</p><!-- --><p>Eriogonum has a long history of aboriginal use. Today, several members of the genus are in cultivation, especially in the rock or alpine garden (G. Nicholls 2002).</p><!-- --><p>Members of Eriogonum are hosts for a number of butterfly species, including such endangered ones as the El Segundo dotted-blue (Euphilotes battoides allyni), Smith’s dotted blue (Euphilotes enoptes smithi), and Lange’s metalmark (Apodemia mormo Iangei). Species of the genus Euphilotes spend their entire life on particular species complexes. Other butterfly species found in association with Eriogonum and relatives (see P. A. Opler and A. B. Wright 1999) include the western green hairstreak (Callophrys affinis), desert green or Comstock’s hairstreak (C. comstocki), bramble hairstreak (C. dumetorum), Lembert’s hairstreak (C. lemberti), Sheridan’s green hairstreak (C. sheridani), green hairstreak (C. viridis), varied blue (Chalceria heteronea), Rocky Mountain dotted-blue (Euphilotes ancilla), Bauer’s dotted-blue (E. baueri), Bernardino dotted-blue (E. bernardino), Ellis’s dotted-blue (E. ellisi), Pacific dotted-blue (E. enoptes), intermediate dotted-blue (E. intermedia), Mojave dotted-blue (E. mojave), pallid dotted-blue (E. pallescens), Rita dotted-blue (E. rita), Spalding’s dotted-blue (E. spaldingi), Gorgon copper (Gaeides gorgon), gayas or Edward’s blue (Hemiargus ceranus gyas), blue copper (Lycaena heteronea), small blue (Philotiella speciosa), Boisduval’s blue (Plebeius icarioides), acmon blue (P. acmon), lupine blue (P. lupini), veined blue (P. neurona), California hairstreak (Satyrium californica), nut-brown hairstreak (S. saepium), Avalon scrub-hairstreak (Strymon avalona), and gray hairstreak (S. melinus). Flowering plants of Eriogonum are infrequently visited by the sooty hairstreak (Satyrium fulginosum), the flowers being a source of nectar for adults. According to Opler, several additional species and subspecies of these butterflies remain to be described.</p> |tables= |references={{Treatment/Reference |id=reveal1973a |text=Reveal, J. L. 1973b. Eriogonum (Polygonaceae) of Utah. Phytologia 25: 169–217. }}{{Treatment/Reference |id=reveal1976a |text=Reveal, J. L. 1976. Eriogonum (Polygonaceae) of Arizona and New Mexico. Phytologia 34: 409–484. }}{{Treatment/Reference |id=reveal1985a |text=Reveal, J. L. 1985. An annotated key to Eriogonum (Polygonaceae) of Nevada. Great Basin Naturalist 45: 493–519. }}{{Treatment/Reference |id=stokes1936a |text=Stokes, S. G. 1936. The Genus Eriogonum, a Preliminary Study Based on Geographical Distribution. San Francisco. }} }}<!-- --><div class="treatment-key"> ==Key== <div class="treatment-key-group"> <h3 class="treatment-key-header" id="key-0">Key to the Subgenera of Eriogonum</h3> {| class="wikitable fna-keytable" |-id=key-0-1 |1 |Flowers attenuate at base, sometimes only weakly so, stipelike base not at all winged; inflorescence bracts 2-10 or sometimes more |[[#key-0-2| > 2]] |-id=key-0-1 |1 |Flowers not attenuate at base, stipelike base absent or, if present, then slightly winged; inflorescence bracts usually 3 |[[#key-0-3| > 3]] |-id=key-0-2 |2 |Tall, erect perennials; perianths white-tomentose. |[[Eriogonum subg. Eriogonum|Eriogonum subg. Eriogonum]] |-id=key-0-2 |2 |Low, spreading, cespitose to shrubby, perianths glabrous or, if pubescent, not white-tomentose |[[Eriogonum subg. Oligogonum|Eriogonum subg. Oligogonum]] |-id=key-0-3 |3 |Plants annual or, if perennial, then involucres usually distinctly pedunculate; leaves usually basal, usually tomentose at least abaxially, or if pilose or strigose then plants of desert regions |[[#key-0-4| > 4]] |-id=key-0-3 |3 |Plants perennial herbs, subshrubs, or shrubs or, if annual or biennial, then stems usually 1, leafy throughout, and plants polygamodioecious; involucres (except 1 at fork of node in some) typically sessile, or if pedunculate throughout then leaves neither roundish and plants from central and southern Texas, nor perianths yellow-hispid and leaves hirsute |[[#key-0-5| > 5]] |-id=key-0-4 |4 |Involucres smooth, not ribbed or angled, usually on a peduncle or, if sessile, then involucres not appressed to inflorescence branches |[[Eriogonum subg. Ganysma|Eriogonum subg. Ganysma]] |-id=key-0-4 |4 |Involucres angled to strongly ribbed, strongly appressed to inflorescence branches and sessile or terminal on bracteated branchlets, rarely pedunculate |[[Eriogonum subg. Oregonium|Eriogonum subg. Oregonium]] |-id=key-0-5 |5 |Plants herbaceous perennials, subshrubs, or shrubs, sometimes nearly arborescent, without jointed stems, without winged or distinctly ridged achenes |[[Eriogonum subg. Eucycla|Eriogonum subg. Eucycla]] |-id=key-0-5 |5 |Plants annuals or biennials or, if perennials, then stems jointed basally, or achenes winged or distinctly ridged |[[#key-0-6| > 6]] |-id=key-0-6 |6 |Plants biennial or annual |[[Eriogonum subg. Micrantha|Eriogonum subg. Micrantha]] |-id=key-0-6 |6 |Plants perennial |[[#key-0-7| > 7]] |-id=key-0-7 |7 |Involucres sessile in axils of inflorescence bracts, becoming ruptured at maturity by numerous bractlets and pubescent flowers; stems jointed basally |[[Eriogonum subg. Clastomyelon|Eriogonum subg. Clastomyelon]] |-id=key-0-7 |7 |Involucres pedunculate, not ruptured by bractlets and (usually glabrous)flowers; stems not jointed basally |[[Eriogonum subg. Pterogonum|Eriogonum subg. Pterogonum]] |} </div></div><!-- -->{{#Taxon: name=Eriogonum |author=James L. Reveal |authority=Michaux |rank=genus |parent rank=subfamily |synonyms= |basionyms= |family=Polygonaceae |illustrator=John Myers |illustration copyright=Flora of North America Association |distribution=North America (including n Mexico) |reference=reveal1973a;reveal1976a;reveal1985a;stokes1936a |publication title=Fl. Bor.-Amer. |publication year=1803 |special status= |source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V5/V5_444.xml |subfamily=Polygonaceae subfam. Eriogonoideae |genus=Eriogonum |achene architecture=winged |achene coloration=yellow;black;yellow;black;brown |achene position=included;exserted |achene pubescence=pubescent;glabrous |achene shape=3-gonous;lenticular;ridged |achene variability=various |anther coloration=usually red;cream or yellow |anther shape=oblong;ellipsoid or oval |basal leaf condition=marcescent |basal leaf duration=deciduous;persistent;deciduous |basal leaf length or size=longer |basal leaf life cycle=anthesis |base shape=stipelike |blade architecture or shape=entire |blade shape=linear;orbiculate |bract architecture=not awn-tipped |bract architecture or shape=leaflike |bract fusion=connate |bract pubescence=glandular;pubescent;glabrous |bract quantity=2;13 |bract shape=scale-like;semileaflike;scale-like;semileaflike |branch architecture=grooved;disarticulating;dichotomous |branch architecture or function or pubescence=glandular |branch architecture or pubescence or relief=smooth |branch fragility=not brittle |branch location=aerial |branch pubescence=puberulent;pilose-pubescent;puberulent;pilose-pubescent;hispid;sericeous;floccose;tomentose;lanate |branch relief=scabrellous |branch shape=ridged;angled;round |caudex stem architecture or arrangement=compact |caudex stem orientation=spreading;erect |caudex stem presence=absent |caudex stem texture=woody |cauline leaf architecture or arrangement=fasciculate |cauline leaf arrangement=whorled;opposite;whorled;opposite;alternate |cauline leaf quantity=1 |embryo course=straight;curved |filament fusion=adnate |filament pubescence=pubescent;glabrous |flower atypical quantity=2;6 |flower quantity=6;100 |flower reproduction=unisexual;,;bisexual |flowering-stem architecture=disarticulating;solid or;slightly distinctly hollow |flowering-stem growth form or orientation=decumbent to erect;prostrate |flowering-stem location=aerial |flowering-stem orientation=arising |flowering-stem shape=fistulose |flowering-stem size=slender;stout |inflorescence architecture=uniparous;compound-umbellate;simple;branched;cymose |inflorescence architecture or shape=capitate;subcapitate |inflorescence arrangement=racemose |inflorescence position=axillary |inflorescence position or structure subtype=terminal;terminal |initial node architecture=trichotomous |involucre architecture or pubescence or relief=smooth |involucre quantity=1;8 |involucre shape=narrowly turbinate;broadly campanulate or hemispheric |leaf architecture or shape=sheathing |leaf duration=persistent |peduncle presence=absent |peduncle quantity=erect to deflexed |perianth coloration=usually white;red or variously yellow |perianth pubescence=glandular;pubescent;glabrous |perianth shape=cylindric;urceolate |petiole presence=absent |petiole prominence=obscure |proximal node quantity=3 |season duration=persistent;persistent |season life cycle=anthesis;anthesis |segment shape=ringlike |stamen quantity=9 |stem architecture or function or pubescence=glandular |stem growth form or orientation=decumbent to erect;prostrate |stem presence=absent |stem pubescence=pubescent;glabrous |taproot architecture=chambered;solid;chambered;solid |taproot size=slender;stout |tepal architecture=monomorphic |tepal architecture or shape=emarginate;entire |tepal fusion=connate |tepal growth form=dimorphic |tepal length=0;1/2 |tepal quantity=6 |time quantity=single |tooth architecture=lobelike |tooth architecture or shape=not awned |tooth quantity=5;10 |whole_organism duration=annual;biennial;annual;biennial;perennial;annual;biennial;annual;biennial;perennial |whole_organism growth form=herb;subshrub;shrub |whole_organism reproduction=synoecious;monocarpic;polycarpic;synoecious;monocarpic;,;polycarpic |x chromosome quantity=10 }}<!-- -->[[Category:Treatment]][[Category:Polygonaceae subfam. Eriogonoideae]] Templates used on this page: Template:Polygonaceae (view source) Template:Treatment/AuthorLink (view source) Template:Treatment/Body (view source) Template:Treatment/Body/Maps (view source) Template:Treatment/ID (view source) Template:Treatment/Publication (view source) Template:Treatment/Reference (view source) Return to Eriogonum.