View source for Poa annua ← Poa annua 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=Poa annua |accepted_authority=L. |publications= |common_names=Annual bluegrass |basionyms= |synonyms={{Treatment/ID/Synonym |name=Poa annua var. reptans |authority=unknown }}{{Treatment/ID/Synonym |name=Poa annua var. aquatica |authority=unknown }} |hierarchy=Poaceae;Poaceae subfam. Pooideae;Poaceae tribe Poeae;Poa;Poa subg. Poa;Poa sect. Micrantherae;Poa annua |hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Poaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Poaceae subfam. Pooideae]]</div><div class="higher-taxon"><small>tribe</small>[[Poaceae tribe Poeae]]</div><div class="higher-taxon"><small>genus</small>[[Poa]]</div><div class="higher-taxon"><small>subgenus</small>[[Poa subg. Poa]]</div><div class="higher-taxon"><small>section</small>[[Poa sect. Micrantherae]]</div><div class="higher-taxon"><small>species</small>[[Poa annua]]</div></div> |volume=Volume 24 |mention_page= |treatment_page=page 519 }}<!-- --><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>usually annual, rarely surviving for a second season; not rhizomatous, sometimes stoloniferous, densely tufted. <b>Basal</b> branching intravaginal, innovations common, similar to the culms. <b>Culms</b> 2-20(45) cm, prostrate to erect, slender; nodes terete, usually 1 exserted. <b>Sheaths</b> closed for about 1/3 their length, terete or weakly compressed, smooth; ligules 0.5-3(5) mm, smooth, glabrous, decurrent, obtuse to truncate; blades 1-10 cm long, 1-3(6) mm wide, flat or weakly folded, thin, soft, smooth, margins usually slightly scabrous, apices broadly prow-shaped. <b>Panicles</b> 1-7(10) cm, lengths 1.2-1.6 times widths, erect; nodes with 1-2(3) branches; branches ascending to spreading or reflexed, straight, terete, smooth, with crowded or loosely arranged spikelets. <b>Spikelets</b> 3-5 mm, laterally compressed; florets 2-6; rachilla internodes smooth, glabrous, concealed or exposed, distal internodes less than 1/2(3/4) the length of the distal lemma. <b>Glumes</b> smooth, distinctly keeled, keels smooth; lower glumes 1-veined; upper glumes shorter than or subequal to the lowest lemma; calluses glabrous; lemmas 2.5-4 mm, lanceolate, distinctly keeled, smooth throughout, the keels, marginal veins, and, usually, lateral veins crisply puberulent to long-villous, rarely glabrous throughout, lateral veins prominent, intercostal regions glabrous, margins smooth, glabrous, apices obtuse to acute; palea keels smooth, usually short- to long-villous, rarely glabrous; anthers 0.6-1.1 mm, oblong prior to dehiscence, those of the upper 1-2 florets usually vestigial. <b>2n</b> = 28.</span><!-- -->{{Treatment/Body |distribution=Conn.;N.J.;N.Y.;Wash.;Va.;Mich.;Del.;D.C;Wis.;Alta.;B.C.;Greenland;Man.;N.B.;Nfld. And Labr.;N.S.;N.W.T.;Ont.;P.E.I.;Que.;Sask.;Yukon;W.Va.;Pacific Islands (Hawaii);Mass.;Maine;N.H.;R.I.;Vt.;Fla.;Wyo.;N.Mex.;Tex.;La.;Tenn.;N.C.;S.C.;Pa.;Calif.;Nev.;Puerto Rico;Colo.;Md.;Alaska;Ala.;Kans.;N.Dak.;Nebr.;Okla.;S.Dak.;Ark.;Ill.;Ga.;Ind.;Iowa;Ariz.;Idaho;Mont.;Oreg.;Ohio;Utah;Mo.;Minn.;Miss.;Ky. |discussion=<p>Poa annua is one of the world's most widespread weeds. It thrives in anthropomorphic habitats outside of the arctic. A native of Eurasia, it is now well established throughout most of the Flora region.</p><!-- --><p>Poa annua is a gynomonoecious tetraploid (possibly rarely polyhaploid), and is thought to have arisen from hybridization between P. infirma (see next) and P. supina (p. 521) (Tutin 1952). It is similar to P. infirma, differing in having larger anthers. It differs from P. chapmaniana (p. 534) in having glabrous calluses and three larger anthers, rather than one. Forms with glabrous lemmas occur sporadically within populations.</p> |tables= |references= }}<!-- --><!-- -->{{#Taxon: name=Poa annua |author= |authority=L. |rank=species |parent rank=section |synonyms=Poa annua var. reptans;Poa annua var. aquatica |basionyms= |family=Poaceae |distribution=Conn.;N.J.;N.Y.;Wash.;Va.;Mich.;Del.;D.C;Wis.;Alta.;B.C.;Greenland;Man.;N.B.;Nfld. And Labr.;N.S.;N.W.T.;Ont.;P.E.I.;Que.;Sask.;Yukon;W.Va.;Pacific Islands (Hawaii);Mass.;Maine;N.H.;R.I.;Vt.;Fla.;Wyo.;N.Mex.;Tex.;La.;Tenn.;N.C.;S.C.;Pa.;Calif.;Nev.;Puerto Rico;Colo.;Md.;Alaska;Ala.;Kans.;N.Dak.;Nebr.;Okla.;S.Dak.;Ark.;Ill.;Ga.;Ind.;Iowa;Ariz.;Idaho;Mont.;Oreg.;Ohio;Utah;Mo.;Minn.;Miss.;Ky. |reference=None |publication title= |publication year= |special status= |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V24/V24_728.xml |subfamily=Poaceae subfam. Pooideae |tribe=Poaceae tribe Poeae |genus=Poa |subgenus=Poa subg. Poa |section=Poa sect. Micrantherae |species=Poa annua }}<!-- -->[[Category:Treatment]][[Category:Poa sect. Micrantherae]] 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/ID/Special status (view source) Template:Treatment/ID/Synonym (view source) Return to Poa annua.