View source for Leersia ← Leersia 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=Leersia |accepted_authority=Sw. |publications= |basionyms= |synonyms= |hierarchy=Poaceae;Poaceae subfam. Ehrhartoideae;Poaceae tribe Oryzeae;Leersia |hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Poaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Poaceae subfam. Ehrhartoideae]]</div><div class="higher-taxon"><small>tribe</small>[[Poaceae tribe Oryzeae]]</div><div class="higher-taxon"><small>genus</small>[[Leersia]]</div></div> |volume=Volume 24 |mention_page= |treatment_page=page 42 }}<!-- --><span class="statement" id="st-d0_s0" data-properties=""><b>Plants </b>usually perennial, rarely annual;</span> <span class="statement" id="st-d0_s1" data-properties="">terrestrial or aquatic;</span> <span class="statement" id="st-d0_s2" data-properties="">rhizomatous or cespitose;</span> <span class="statement" id="st-d0_s3" data-properties="whole_organism duration;whole_organism duration;whole_organism growth form or habitat;whole_organism growth form or habitat;whole_organism architecture;whole_organism growth form;whole_organism reproduction;whole_organism growth form">synoecious.</span> <span class="statement" id="st-d0_s4" data-properties="culm some measurement;culm orientation;culm orientation;culm architecture;culm architecture;culm architecture"><b>Culms </b>20-150 cm (occasionally longer in floating mats), erect or decumbent, often rooting at the nodes, branched or unbranched.</span> <span class="statement" id="st-d0_s5" data-properties="leaf arrangement"><b>Leaves </b>equitably distributed along the culm;</span> <span class="statement" id="st-d0_s6" data-properties="sheath architecture">sheaths open;</span> <span class="statement" id="st-d0_s7" data-properties="auricle presence">auricles absent;</span> <span class="statement" id="st-d0_s8" data-properties="ligule texture">ligules membranous;</span> <span class="statement" id="st-d0_s9" data-properties="pseudopetiole presence">pseudopetioles absent;</span> <span class="statement" id="st-d0_s10" data-properties="blade location;blade shape;blade shape;blade shape or vernation">blades aerial, linear to broadly lanceolate, flat or folded, sometimes involute when dry.</span> <span class="statement" id="st-d0_s11" data-properties="inflorescence position"><b>Inflorescences </b>terminal panicles, usually exserted, axillary panicles sometimes also present;</span> <span class="statement" id="st-d0_s12" data-properties="axillary panicle presence">disarticulation beneath the spikelets.</span> <span class="statement" id="st-d0_s13" data-properties="spikelet reproduction;floret quantity"><b>Spikelets </b>bisexual, with 1 floret;</span> <span class="statement" id="st-d0_s14" data-properties="floret shape;floret shape">florets laterally compressed, linear to suborbicular in sideview.</span> <span class="statement" id="st-d0_s15" data-properties="glume presence"><b>Glumes </b>absent;</span> <span class="statement" id="st-d0_s16" data-properties="callus shape;callus pubescence">calluses not stipelike, glabrous;</span> <span class="statement" id="st-d0_s17" data-properties="lemma size;lemma texture;lemma pubescence;lemma pubescence;lemma architecture or fixation;palea size;palea texture;palea pubescence;palea pubescence;palea architecture or fixation">lemmas and paleas subequal, chartaceous to coriaceous, ciliate-hispid or glabrous, tightly clasping along the margins;</span> <span class="statement" id="st-d0_s18" data-properties="lemma architecture;lemma shape;lemma shape">lemmas 5-veined, obtuse or acute to acuminate, sometimes mucronate, usually unawned;</span> <span class="statement" id="st-d0_s19" data-properties="palea architecture">paleas 3-veined, unawned;</span> <span class="statement" id="st-d0_s20" data-properties="lodicule quantity">lodicules 2;</span> <span class="statement" id="st-d0_s21" data-properties="anther quantity;anther quantity;anther quantity;anther quantity">anthers 1, 2, 3, or 6;</span> <span class="statement" id="st-d0_s22" data-properties="style quantity;base fusion;stigma position;stigma shape">styles 2, bases fused, stigmas laterally exserted, plumose.</span> <span class="statement" id="st-d0_s23" data-properties="caryopse shape"><b>Caryopses </b>laterally compressed;</span> <span class="statement" id="st-d0_s24" data-properties="embryo quantity">embryos about 1/3 as long as the caryopses;</span> <span class="statement" id="st-d0_s25" data-properties="hilum arrangement or course or shape;x chromosome quantity">hila linear, x = 12.</span><!-- -->{{Treatment/Body |distribution=Conn.;N.J.;N.Y.;Wash.;Va.;Del.;D.C;Wis.;W.Va.;Md.;Fla.;Wyo.;N.H.;N.Mex.;Tex.;La.;Tenn.;N.C.;S.C.;Pa.;Nev.;Mass.;Maine;R.I.;Vt.;Puerto Rico;Colo.;Calif.;Ala.;Kans.;N.Dak.;Nebr.;Okla.;S.Dak.;Miss.;Ark.;Ill.;Ga.;Ind.;Iowa;Ariz.;Idaho;Ohio;Utah;Mo.;Minn.;Mich.;Mont.;Ky.;Oreg.;B.C.;Man.;N.B.;N.S.;Ont.;P.E.I.;Que.;Sask. |discussion=<p>Leersia is a genus of about 17 aquatic to mesophytic species, growing primarily in tropical and warm-temperate regions. Five species are native to the Flora region. Leersia is closely allied to Oryza. It is unusual in the variability in stamen numbers among its species.</p> |tables= |references={{Treatment/Reference |id=pyrah1969a |text=Pyrah, G.L. 1969. Taxonomic and distributional studies in Leersia (Gramineae). Iowa State Coll. J. Sci. 44:215-270. }} }}<!-- --><div class="treatment-key"> ==Key== <div class="treatment-key-group"> {| class="wikitable fna-keytable" |-id=key-0-1 |1 |Spikelets 1.5-2 mm long, glabrous; plants not rhizomatous |[[Leersia monandra|Leersia monandra]] |-id=key-0-1 |1 |Spikelets 2.5-6.5 mm long, usually ciliate on the margins and keel, and glabrous or pubescent elsewhere; plants rhizomatous. |[[#key-0-2| > 2]] |-id=key-0-2 |2 |Spikelets nearly as wide as long |[[Leersia lenticularis|Leersia lenticularis]] |-id=key-0-2 |2 |Spikelets not more than 1/2 as wide as long. |[[#key-0-3| > 3]] |-id=key-0-3 |3 |Anthers 2; spikelets 2.5-3.6 mm long; panicle branches single at all nodes |[[Leersia virginica|Leersia virginica]] |-id=key-0-3 |3 |Anthers 3 or 6; spikelets 3.2-6.5 mm long; panicle branches 1-2 or more at the lower nodes, single at the upper nodes. |[[#key-0-4| > 4]] |-id=key-0-4 |4 |Panicles exserted, 5-15 cm long; branches appressed to ascending, spikelet-bearing to near the base; anthers 6; spikelets 3.2-4.7(5) mm long |[[Leersia hexandra|Leersia hexandra]] |-id=key-0-4 |4 |Panicles exserted or enclosed, 10-30 cm long; branches spreading on exserted panicles, naked on the lower 1/3; anthers 3; spikelets (4)4.2-6.5 mm long |[[Leersia oryzoides|Leersia oryzoides]] |} </div></div><!-- -->{{#Taxon: name=Leersia |author=Grant L. Pyrah; |authority=Sw. |rank=genus |parent rank=tribe |synonyms= |basionyms= |family=Poaceae |distribution=Conn.;N.J.;N.Y.;Wash.;Va.;Del.;D.C;Wis.;W.Va.;Md.;Fla.;Wyo.;N.H.;N.Mex.;Tex.;La.;Tenn.;N.C.;S.C.;Pa.;Nev.;Mass.;Maine;R.I.;Vt.;Puerto Rico;Colo.;Calif.;Ala.;Kans.;N.Dak.;Nebr.;Okla.;S.Dak.;Miss.;Ark.;Ill.;Ga.;Ind.;Iowa;Ariz.;Idaho;Ohio;Utah;Mo.;Minn.;Mich.;Mont.;Ky.;Oreg.;B.C.;Man.;N.B.;N.S.;Ont.;P.E.I.;Que.;Sask. |reference=pyrah1969a |publication title= |publication year= |special status= |source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V24/V24_40.xml |subfamily=Poaceae subfam. Ehrhartoideae |tribe=Poaceae tribe Oryzeae |genus=Leersia |anther quantity=6;3;2;1 |auricle presence=absent |axillary panicle presence=absent |base fusion=fused |blade location=aerial |blade shape=linear;broadly lanceolate flat or folded |blade shape or vernation=involute |callus pubescence=glabrous |callus shape=not stipelike |caryopse shape=compressed |culm architecture=unbranched;branched;rooting |culm orientation=decumbent;erect |culm some measurement=20cm;150cm |embryo quantity=1/3 |floret quantity=1 |floret shape=linear;suborbicular |glume presence=absent |hilum arrangement or course or shape=linear |inflorescence position=exserted |leaf arrangement=distributed |lemma architecture=5-veined |lemma architecture or fixation=clasping |lemma pubescence=glabrous;ciliate-hispid |lemma shape=mucronate;acute;acuminate |lemma size=subequal |lemma texture=chartaceous;coriaceous |ligule texture=membranous |lodicule quantity=2 |palea architecture=3-veined |palea architecture or fixation=clasping |palea pubescence=glabrous;ciliate-hispid |palea size=subequal |palea texture=chartaceous;coriaceous |pseudopetiole presence=absent |sheath architecture=open |spikelet reproduction=bisexual |stigma position=exserted |stigma shape=plumose |style quantity=2 |whole_organism architecture=rhizomatous |whole_organism duration=annual;perennial |whole_organism growth form=plant;cespitose |whole_organism growth form or habitat=aquatic;terrestrial |whole_organism reproduction=synoecious |x chromosome quantity=12 }}<!-- -->[[Category:Treatment]][[Category:Poaceae tribe Oryzeae]] Templates used on this page: Template:Poaceae (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/Reference (view source) Return to Leersia.