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 |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-d0_s0" data-properties=""><b>Plants </b>usually annual, rarely surviving for a second season;</span> <span class="statement" id="st-d0_s1" data-properties="">not rhizomatous, sometimes stoloniferous, densely tufted.</span> <span class="statement" id="st-d0_s2" data-properties="whole_organism duration;whole_organism architecture;whole_organism architecture;whole_organism arrangement or pubescence;whole_organism position;whole_organism growth form;whole-organism architecture;whole-organism position;innovation quantity"><b>Basal </b>branching intravaginal, innovations common, similar to the culms.</span> <span class="statement" id="st-d0_s3" data-properties="culm atypical some measurement;culm some measurement;culm orientation;culm size"><b>Culms </b>2-20 (45) cm, prostrate to erect, slender;</span> <span class="statement" id="st-d0_s4" data-properties="node shape;node quantity;node position">nodes terete, usually 1 exserted.</span> <span class="statement" id="st-d0_s5" data-properties="sheath length;sheath shape;sheath shape;sheath architecture or pubescence or relief"><b>Sheaths </b>closed for about 1/3 their length, terete or weakly compressed, smooth;</span> <span class="statement" id="st-d0_s6" data-properties="ligule atypical some measurement;ligule some measurement;ligule architecture or pubescence or relief;ligule pubescence;ligule shape;ligule shape">ligules 0.5-3 (5) mm, smooth, glabrous, decurrent, obtuse to truncate;</span> <span class="statement" id="st-d0_s7" data-properties="blade length;blade width;blade width;blade shape;blade shape;blade width;blade pubescence or texture;blade architecture or pubescence or relief;margin pubescence or relief;apex shape">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.</span> <span class="statement" id="st-d0_s8" data-properties="panicle atypical some measurement;panicle some measurement;panicle l w ratio;panicle orientation"><b>Panicles </b>1-7 (10) cm, lengths 1.2-1.6 times widths, erect;</span> <span class="statement" id="st-d0_s9" data-properties="branch atypical quantity;branch quantity">nodes with 1-2 (3) branches;</span> <span class="statement" id="st-d0_s10" data-properties="branch orientation;branch course;branch shape;branch architecture or pubescence or relief;spikelet arrangement;spikelet arrangement">branches ascending to spreading or reflexed, straight, terete, smooth, with crowded or loosely arranged spikelets.</span> <span class="statement" id="st-d0_s11" data-properties="spikelet some measurement;spikelet shape"><b>Spikelets </b>3-5 mm, laterally compressed;</span> <span class="statement" id="st-d0_s12" data-properties="floret quantity">florets 2-6;</span> <span class="statement" id="st-d0_s13" data-properties="rachilla internode architecture or pubescence or relief;rachilla internode pubescence;rachilla internode prominence;rachilla internode prominence;distal internode quantity">rachilla internodes smooth, glabrous, concealed or exposed, distal internodes less than 1/2 (3/4) the length of the distal lemma.</span> <span class="statement" id="st-d0_s14" data-properties="glume architecture or pubescence or relief;glume shape;keel architecture or pubescence or relief"><b>Glumes </b>smooth, distinctly keeled, keels smooth;</span> <span class="statement" id="st-d0_s15" data-properties="lower glume architecture">lower glumes 1-veined;</span> <span class="statement" id="st-d0_s16" data-properties="upper glume height or length or size;lowest lemma size">upper glumes shorter than or subequal to the lowest lemma;</span> <span class="statement" id="st-d0_s17" data-properties="callus pubescence">calluses glabrous;</span> <span class="statement" id="st-d0_s18" data-properties="lemma some measurement;lemma shape;lemma shape;lemma architecture or pubescence or relief;lateral-vein pubescence;lateral-vein pubescence;lateral-vein prominence;intercostal region pubescence;margin architecture or pubescence or relief;margin pubescence;apex shape">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;</span> <span class="statement" id="st-d0_s19" data-properties="palea keel architecture or pubescence or relief;palea keel height or length or size;palea keel pubescence;palea keel pubescence">palea keels smooth, usually short to long-villous, rarely glabrous;</span> <span class="statement" id="st-d0_s20" data-properties="floret position;floret quantity;floret prominence">anthers 0.6-1.1 mm, oblong prior to dehiscence, those of the upper 1-2 florets usually vestigial.</span> <span class="statement" id="st-d0_s21" data-properties="anther some measurement;anther prior-to-dehiscence;2n chromosome quantity">2n = 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 |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://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/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 |2n chromosome quantity=28 |anther prior-to-dehiscence=oblong |anther some measurement=0.6mm;1.1mm |apex shape=obtuse;acute |blade architecture or pubescence or relief=smooth |blade length=1cm;10cm |blade pubescence or texture=soft |blade shape=folded;flat |blade width=thin;1mm;3mm |branch architecture or pubescence or relief=smooth |branch atypical quantity=3 |branch course=straight |branch orientation=ascending;spreading or reflexed |branch quantity=1;2 |branch shape=terete |callus pubescence=glabrous |culm atypical some measurement=45 |culm orientation=prostrate;erect |culm size=slender |culm some measurement=2cm;20cm |distal internode quantity=0;1/23/4 |floret position=upper |floret prominence=vestigial |floret quantity=1;2 |glume architecture or pubescence or relief=smooth |glume shape=keeled |innovation quantity=common |intercostal region pubescence=glabrous |keel architecture or pubescence or relief=smooth |lateral-vein prominence=prominent |lateral-vein pubescence=glabrous;crisply puberulent;long-villous |lemma architecture or pubescence or relief=smooth |lemma shape=keeled;lanceolate |lemma some measurement=2.5mm;4mm |ligule architecture or pubescence or relief=smooth |ligule atypical some measurement=5 |ligule pubescence=glabrous |ligule shape=obtuse;truncate |ligule some measurement=0.5mm;3mm |lower glume architecture=1-veined |lowest lemma size=subequal |margin architecture or pubescence or relief=smooth |margin pubescence=glabrous |margin pubescence or relief=scabrous |node position=exserted |node quantity=1 |node shape=terete |palea keel architecture or pubescence or relief=smooth |palea keel height or length or size=short |palea keel pubescence=glabrous;long-villous |panicle atypical some measurement=10 |panicle l w ratio=1.2-1.6 |panicle orientation=erect |panicle some measurement=1cm;7cm |rachilla internode architecture or pubescence or relief=smooth |rachilla internode prominence=exposed;concealed |rachilla internode pubescence=glabrous |sheath architecture or pubescence or relief=smooth |sheath length=closed |sheath shape=compressed;terete |spikelet arrangement=arranged;crowded |spikelet shape=compressed |spikelet some measurement=3mm;5mm |upper glume height or length or size=shorter |whole-organism architecture=branching |whole-organism position=intravaginal |whole_organism architecture=stoloniferous;not rhizomatous |whole_organism arrangement or pubescence=tufted |whole_organism duration=annual |whole_organism growth form=plant |whole_organism position=basal }}<!-- -->[[Category:Treatment]][[Category:Poa sect. 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