View source for Poa arctica subsp. aperta

{{Treatment/ID
|accepted_name=Poa arctica subsp. aperta
|accepted_authority=(Scribn. & Merr.) Soreng
|publications=
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Poa aperta
|authority=
|rank=species
}}
|hierarchy=Poaceae;Poaceae subfam. Pooideae;Poaceae tribe Poeae;Poa;Poa subg. Poa;Poa sect. Poa;Poa arctica;Poa arctica subsp. aperta
|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. Poa]]</div><div class="higher-taxon"><small>species</small>[[Poa arctica]]</div><div class="higher-taxon"><small>subspecies</small>[[Poa arctica subsp. aperta]]</div></div>
|volume=Volume 24
|mention_page=
|treatment_page=page 530
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>pale green, often glaucous; usually densely tufted, rhizomes usually short, usually well developed. <b>Culms</b> 20-60 cm, several together, wiry, bases decumbent. <b>Sheaths</b> closed for (1/6)1/5 – 1/3 their length; ligules 3-7 mm, sparsely to moderately scabrous, acute; blades 1.5-2.5 mm wide, flat, folded, or somewhat involute. <b>Panicles</b> 4-15 cm, erect, loosely contracted or open, with 1-3 branches per node; branches ascending or widely spreading, fairly stout, fairly straight, smooth to very sparsely scabrous, proximal branches 1/4-1/2 the panicle length. <b>Spikelets</b> narrowly lanceolate to lanceolate, not bulbiferous; florets 2-3(4), normal; rachilla internodes usually glabrous, infrequently sparsely softly puberulent; calluses glabrous or webbed, hairs to 1/4 the lemma length; lemmas 3-4.5(6) mm; palea keels usually softly puberulent to long-villous at midlength, infrequently glabrous, intercostal regions usually softly puberulent; anthers aborted late in development or fully developed. <b>2n</b> = 98+1.</span><!--

-->{{Treatment/Body
|discussion=<p><i>Poa arctica </i>subsp.<i> aperta</i> is restricted to subalpine and low alpine habitats on the Wasatch Escarpment and high mountains of the Colorado Plateau in southern Utah, and the Rocky Mountains of southern Colorado and northern New Mexico. Many reports of <i>P. arida</i> (p. 599) growing west of the Rocky Mountains are based on misidentification of this subspecies. <i>Poa arctica </i>subsp.<i> aperta</i> may reflect introgression of genes from <i>P. secunda</i> (p. 586) into <i>P. arctica</i>. It has softer leaves, and is more densely hairy between the lemma veins and the palea keels, than <i></i>subsp.<i> arctica</i>. It can be distinguished from <i></i>subsp.<i> grayana</i> by its more wiry culms, and less contracted panicles with straighter branches.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Poa arctica subsp. aperta
|authority=(Scribn. & Merr.) Soreng
|rank=subspecies
|parent rank=species
|synonyms=Poa aperta
|basionyms=
|family=Poaceae
|illustrator=Sandy Long
|illustration copyright=Utah State University
|reference=None
|publication title=
|publication year=
|special status=Endemic
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/200273ad09963decb8fc72550212de541d86569d/coarse_grained_fna_xml/V24/V24_743.xml
|subfamily=Poaceae subfam. Pooideae
|tribe=Poaceae tribe Poeae
|genus=Poa
|subgenus=Poa subg. Poa
|section=Poa sect. Poa
|species=Poa arctica
|subspecies=Poa arctica subsp. aperta
}}<!--

-->[[Category:Treatment]][[Category:Poa arctica]]