View source for Poa arida ← Poa arida 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 arida |accepted_authority=Vasey |publications= |common_names=Plains bluegrass |special_status={{Treatment/ID/Special_status |code=E |label=Endemic }} |basionyms= |synonyms={{Treatment/ID/Synonym |name=Poa glaucifolia |authority= |rank=species }} |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-d0_s0" data-properties=""><b>Plants </b>perennial;</span> <span class="statement" id="st-d0_s1" data-properties="">glaucous or not;</span> <span class="statement" id="st-d0_s2" data-properties="whole_organism duration;whole_organism pubescence;whole_organism pubescence;whole_organism arrangement or pubescence;whole_organism growth form">densely to loosely tufted or the culms solitary, rhizomatous.</span> <span class="statement" id="st-d0_s3" data-properties="culm architecture or arrangement or growth form;culm architecture;culm position;culm architecture;culm position"><b>Basal </b>branching intra and extravaginal.</span> <span class="statement" id="st-d0_s4" data-properties="culm some measurement;culm orientation;base growth form or orientation;base shape;base shape"><b>Culms </b>15-80 cm, erect or the bases decumbent, terete or weakly compressed;</span> <span class="statement" id="st-d0_s5" data-properties="node shape;node quantity;node position">nodes terete, 0-1 exserted.</span> <span class="statement" id="st-d0_s6" data-properties="sheath length;sheath shape;sheath pubescence;sheath pubescence;sheath pubescence;base pubescence;distal sheath length"><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;</span> <span class="statement" id="st-d0_s7" data-properties="ligule atypical some measurement;ligule some measurement;ligule architecture or pubescence or relief;ligule pubescence or relief;apex shape">ligules (1) 1.5-4 (5) mm, smooth or sparsely to moderately scabrous, apices obtuse to acute;</span> <span class="statement" id="st-d0_s8" data-properties="blade length;blade width;blade prominence or shape;blade width;blade architecture or shape;blade width;blade texture;abaxial surface architecture or pubescence or relief;adaxial surface architecture or pubescence or relief;adaxial surface pubescence or relief;apex shape;blade-leaf atypical distance;blade-leaf distance">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.</span> <span class="statement" id="st-d0_s9" data-properties="panicle atypical some measurement;panicle some measurement;panicle orientation;panicle shape;panicle condition or size;panicle architecture;panicle condition or size;panicle architecture or arrangement;spikelet quantity"><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;</span> <span class="statement" id="st-d0_s10" data-properties="branch quantity">nodes with 1-5 branches;</span> <span class="statement" id="st-d0_s11" data-properties="branch some measurement;branch orientation;branch orientation;branch shape;branch architecture or pubescence or relief;angle pubescence or relief;spikelet quantity">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.</span> <span class="statement" id="st-d0_s12" data-properties="spikelet some measurement;spikelet l w ratio;spikelet shape"><b>Spikelets </b>3.2-7 mm, lengths to 3.5 (3.8) times widths, laterally compressed;</span> <span class="statement" id="st-d0_s13" data-properties="floret quantity">florets 2-7;</span> <span class="statement" id="st-d0_s14" data-properties="rachilla internode architecture or pubescence or relief;rachilla internode pubescence">rachilla internodes smooth, sometimes sparsely puberulent.</span> <span class="statement" id="st-d0_s15" data-properties="glume shape;glume shape;glume architecture or pubescence or relief;glume pubescence or relief"><b>Glumes </b>lanceolate, distinctly keeled, smooth or sparsely scabrous;</span> <span class="statement" id="st-d0_s16" data-properties="lower glume architecture">lower glumes 3-veined;</span> <span class="statement" id="st-d0_s17" data-properties="callus pubescence;callus pubescence;hair quantity">calluses usually glabrous, infrequently webbed, hairs to 1/4 the lemma length;</span> <span class="statement" id="st-d0_s18" data-properties="lemma some measurement;lemma shape;lemma shape;keel height or length or size;keel pubescence;marginal vein height or length or size;marginal vein pubescence;lateral-vein prominence;lateral-vein pubescence;lateral-vein pubescence;intercostal region pubescence;intercostal region pubescence;hair some measurement;margin pubescence;apex shape;apex shape">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;</span> <span class="statement" id="st-d0_s19" data-properties="palea keel pubescence;palea keel pubescence;palea keel pubescence;palea keel pubescence;intercostal region position;intercostal region pubescence">palea keels scabrous, glabrous or short-villous at midlength, intercostal regions usually glabrous, sometimes puberulent to short-villous;</span> <span class="statement" id="st-d0_s20" data-properties="anther some measurement;2n chromosome quantity;2n chromosome quantity;2n chromosome quantity;2n chromosome quantity;2n chromosome quantity;2n chromosome quantity;2n chromosome quantity;2n chromosome quantity;2n chromosome quantity;2n chromosome quantity;2n chromosome quantity;2n chromosome quantity;2n chromosome quantity;2n chromosome quantity">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>Poa arida 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 P. arctica subsp. aperta (p. 530). P. arctica subsp. grayana (p. 532), and rhizomatous specimens of P. fendleriana (p. 556).</p><!-- --><p>Poa arida may reflect past hybridization between P. secunda (p. 586) and a species of Poa sect. Poa. Poa 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 P. arida sensu stricto usually has 2n = 63, 64, or greater than 70. It is suspected that some of the variability reflects introgression from P. secunda.</p><!-- --><p>Poa arida is a named intersectional hybrid</p> |tables= |references= }}<!-- --><!-- -->{{#Taxon: name=Poa arida |authority=Vasey |rank=species |parent rank=genus |synonyms=Poa glaucifolia |basionyms= |family=Poaceae |illustrator=Sandy Long |illustration copyright=Utah State University |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=Endemic |source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V24/V24_845.xml |subfamily=Poaceae subfam. Pooideae |tribe=Poaceae tribe Poeae |genus=Poa |species=Poa arida |2n chromosome quantity=103;100;5;90;84;76;70;64;63;56;58 |abaxial surface architecture or pubescence or relief=smooth |adaxial surface architecture or pubescence or relief=smooth |adaxial surface pubescence or relief=scabrous |angle pubescence or relief=scabrous |anther some measurement=1.3mm;2.2mm |apex shape=blunt;acute;prow--shaped;obtuse;acute |base growth form or orientation=decumbent |base pubescence=glabrous |base shape=compressed;terete |blade architecture or shape=folded |blade length=reduced |blade prominence or shape=flat |blade texture=firm |blade width=thick;thin;1.5mm;5mm |blade-leaf atypical distance=0.4 |blade-leaf distance=1cm;7cm |branch architecture or pubescence or relief=smooth |branch orientation=spreading;erect;infrequently ascending |branch quantity=1;5 |branch shape=terete;weakly angled |branch some measurement=1cm;9cm |callus pubescence=webbed;glabrous |culm architecture=branching;rhizomatous |culm architecture or arrangement or growth form=solitary |culm orientation=erect |culm position=extravaginal;basal |culm some measurement=15cm;80cm |distal sheath length=(1.2)1.5-9(20) times blade lengths |floret quantity=2;7 |glume architecture or pubescence or relief=smooth |glume pubescence or relief=scabrous |glume shape=keeled;lanceolate |hair quantity=0;1/4 |hair some measurement=0mm;0.3mm |intercostal region position=midlength |intercostal region pubescence=glabrous;hairy;glabrous |keel height or length or size=short |keel pubescence=long-villous |lateral-vein prominence=prominent |lateral-vein pubescence=puberulent;glabrous |lemma shape=lanceolate;narrowly lanceolate |lemma some measurement=2.5mm;4.5mm |ligule architecture or pubescence or relief=smooth |ligule atypical some measurement=1 |ligule pubescence or relief=scabrous |ligule some measurement=1.5mm;4mm |lower glume architecture=3-veined |margin pubescence=glabrous |marginal vein height or length or size=short |marginal vein pubescence=long-villous |node position=exserted |node quantity=0;1 |node shape=terete |palea keel pubescence=puberulent;short-villous |panicle architecture=interrupted |panicle architecture or arrangement=congested |panicle atypical some measurement=2.5 |panicle condition or size=contracted;contracted |panicle orientation=erect |panicle shape=lanceoloid |panicle some measurement=4cm;12cm |rachilla internode architecture or pubescence or relief=smooth |rachilla internode pubescence=puberulent |sheath length=closed |sheath pubescence=glabrous;scabrous;smooth |sheath shape=terete |spikelet l w ratio=0-3.5(3.8) |spikelet quantity=3;24 |spikelet shape=compressed |spikelet some measurement=3.2mm;7mm |whole_organism arrangement or pubescence=tufted |whole_organism duration=perennial |whole_organism growth form=plant |whole_organism pubescence=not;glaucous }}<!-- -->[[Category:Treatment]][[Category:Poa]] 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 arida.