View source for Poa annua

{{Treatment/ID
|accepted_name=Poa annua
|accepted_authority=L.
|publications=
|common_names=Annual bluegrass
|special_status={{Treatment/ID/Special_status
|code=I
|label=Introduced
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Poa annua var. reptans
|authority=
|rank=variety
}} {{Treatment/ID/Synonym
|name=Poa annua var. aquatica
|authority=
|rank=variety
}}
|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><i>Poa annua</i> 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><i>Poa annua</i> is a gynomonoecious tetraploid (possibly rarely polyhaploid), and is thought to have arisen from hybridization between <i>P. infirma</i> (see next) and <i>P. supina</i> (p. 521) (Tutin 1952). It is similar to <i>P. infirma</i>, differing in having larger anthers. It differs from <i>P. chapmaniana</i> (p. 534) in having glabrous calluses and three larger anthers, rather than one. Forms with glabrous lemmas occur sporadically within populations.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Poa annua
|authority=L.
|rank=species
|parent rank=section
|synonyms=Poa annua var. reptans;Poa annua var. aquatica
|basionyms=
|family=Poaceae
|illustrator=Sandy Long
|illustration copyright=Utah State University
|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=Introduced
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/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]]