View source for Poa arida

{{Treatment/ID
|accepted_name=Poa arida
|accepted_authority=Vasey
|publications=
|common_names=Plains bluegrass
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Poa glaucifolia
|authority=unknown
}}
|hierarchy=Poaceae;Poaceae subfam. Pooideae;Poaceae tribe Poeae;Poa;Poa arida
|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>species</small>[[Poa arida]]</div></div>
|volume=Volume 24
|mention_page=
|treatment_page=page 599
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>perennial; glaucous or not; densely to loosely tufted or the culms solitary, rhizomatous. <b>Basal</b> branching intra- and extravaginal. <b>Culms</b> 15-80 cm, erect or the bases decumbent, terete or weakly compressed; nodes terete, 0-1 exserted. <b>Sheaths</b> closed for 1/10 – 1/5(1/4) their length, terete, smooth or sparsely scabrous, glabrous, bases of basal sheaths glabrous, distal sheath lengths (1.2)1.5-9(20) times blade lengths; ligules (1)1.5-4(5) mm, smooth or sparsely to moderately scabrous, apices obtuse to acute; blades strongly to gradually reduced in length distally, 1.5-5 mm wide, flat and moderately thin to folded and moderately thick and firm, abaxial surfaces smooth, adaxial surfaces smooth or sparsely to moderately scabrous, primarily over the veins, apices narrowly prow-shaped, flag leaf blades (0.4)1-7(10) cm. <b>Panicles</b> (2.5)4-12(18) cm, erect, usually narrowly lanceoloid, contracted, sometimes interrupted, infrequently loosely contracted, usually congested, with 25-100 spikelets; nodes with 1-5 branches; branches 1-9 cm, erect to infrequently ascending, rarely spreading, terete to weakly angled, smooth or the angles sparsely to moderately scabrous, with 3-24 spikelets. <b>Spikelets</b> 3.2-7 mm, lengths to 3.5(3.8) times widths, laterally compressed; florets 2-7; rachilla internodes smooth, sometimes sparsely puberulent. <b>Glumes</b> lanceolate, distinctly keeled, smooth or sparsely scabrous; lower glumes 3-veined; calluses usually glabrous, infrequently webbed, hairs to 1/4 the lemma length; lemmas 2.5-4.5 mm, lanceolate to narrowly lanceolate, distinctly to weakly keeled, keels and marginal veins short- to long-villous, lateral veins moderately prominent, glabrous or puberulent, intercostal regions usually glabrous, infrequently hairy, hairs to 0.3 mm, margins glabrous, apices acute or blunt; palea keels scabrous, glabrous or short-villous at midlength, intercostal regions usually glabrous, sometimes puberulent to short-villous; anthers 1.3-2.2 mm. <b>2n</b> = 56, 56+1, 56-58, 63, 64, 70, 76, 84, ca. 90, 95+-5, 100, 103.</span><!--

-->{{Treatment/Body
|distribution=Ill.;Ind.;N.J.;Colo.;N.Mex.;Tex.;Ohio;Minn.;Mich.;Kans.;N.Dak.;Nebr.;Okla.;S.Dak.;Mont.;Alta.;Man.;Ont.;Que.;Sask.;Iowa;Wyo.
|discussion=<p><i>Poa arida</i> grows mainly on the eastern slope of the Rocky Mountains and in the northern Great Plains, primarily in riparian habitats of varying salinity or alkalinity. It is spreading eastward along heavily salted highway corridors. Reports of its occurrence west of the Continental Divide and in southwestern Texas are mostly attributable to misidentifications of <i>P. arctica </i>subsp.<i> aperta</i> (p. 530). <i>P. arctica </i>subsp.<i> grayana</i> (p. 532), and rhizomatous specimens of <i>P. fendleriana</i> (p. 556).</p><!--
--><p><i>Poa arida</i> may reflect past hybridization between <i>P. secunda</i> (p. 586) and a species of <i>Poa </i>sect.<i> Poa</i>. <i>Poa</i> glaucifolia Scribn. & T.A. Williams refers to specimens of the northern Great Plains that have a more lax growth form with broader leaves and occasionally somewhat open panicles, florets with a small web, and sometimes lacking hairs between the keel and marginal veins of the lemma. Plants with these characteristics have chromosome counts of 2ra = 56 and 70, whereas <i>P. arida</i> sensu stricto usually has 2n = 63, 64, or greater than 70. It is suspected that some of the variability reflects introgression from <i>P. secunda</i>.</p><!--
--><p><i>Poa arida</i> is a named intersectional hybrid</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Poa arida
|author=
|authority=Vasey
|rank=species
|parent rank=genus
|synonyms=Poa glaucifolia
|basionyms=
|family=Poaceae
|distribution=Ill.;Ind.;N.J.;Colo.;N.Mex.;Tex.;Ohio;Minn.;Mich.;Kans.;N.Dak.;Nebr.;Okla.;S.Dak.;Mont.;Alta.;Man.;Ont.;Que.;Sask.;Iowa;Wyo.
|reference=None
|publication title=
|publication year=
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V24/V24_845.xml
|subfamily=Poaceae subfam. Pooideae
|tribe=Poaceae tribe Poeae
|genus=Poa
|species=Poa arida
}}<!--

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