View source for Elymus alaskanus

{{Treatment/ID
|accepted_name=Elymus alaskanus
|accepted_authority=(Scribn. & Merr.) Á.Löve
|publications=
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Roegneria villosa
|authority=unknown
}} {{Treatment/ID/Synonym
|name=Roegneria borealis
|authority=unknown
}} {{Treatment/ID/Synonym
|name=Elymus alaskanus subsp. borealis
|authority=unknown
}} {{Treatment/ID/Synonym
|name=Agropyron alaskanum
|authority=unknown
}}
|hierarchy=Poaceae;Poaceae subfam. Pooideae;Poaceae tribe Triticeae;Elymus;Elymus alaskanus
|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 Triticeae]]</div><div class="higher-taxon"><small>genus</small>[[Elymus]]</div><div class="higher-taxon"><small>species</small>[[Elymus alaskanus]]</div></div>
|volume=Volume 24
|mention_page=
|treatment_page=page 326
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>cespitose or weakly rhizomatous. <b>Culms</b> 20-90 cm, sometimes decumbent at the base, ascending to erect above; nodes usually pubescent, sometimes glabrous. <b>Leaves</b> sometimes basally concentrated; sheaths smooth or scabrous, glabrous or pilose; auricles absent or to 0.5 mm; ligules 0.2-1 mm, erose, ciliolate; blades 3-7 mm wide, flat, both surfaces smooth, scabrous, or pubescent. <b>Spikes</b> 3.5-14 cm long, 0.5-0.8 cm wide, erect or nodding distally, usually with 1 spikelet per node, occasionally with 2 at the lower nodes; internodes 3-10 mm long, 0.5-0.8 mm wide, mostly glabrous and smooth, edges scabrous or ciliate. <b>Spikelets</b> 9-15(20) mm, 2-5 times longer than the internodes, appressed, with 3-6 florets, rachillas hispidulous; disarticulation above the glumes, beneath each floret. <b>Glumes</b> 4-8 mm long, (1.2)1.5-2 mm wide, 1/3-2/3 as long as the adjacent lemmas, oblanceolate to obovate, flat, usually purplish, glabrous or hairy, hairs 0.3-0.5 mm, margins unequal, the widest margin 0.4-1 mm wide, both margins widest above the middle, apices unawned or awned, awns to 1 mm; lemmas 7-11 mm, glabrous or hairy, sometimes scabridulous, sometimes more densely hairy distally, hairs 0.2-0.6 mm, all alike, apices unawned or awned, awns to 7 mm, straight; paleas subequal to the lemmas, keels straight below the apices; anthers 1-2 mm. <b>2n</b> = 28.</span><!--

-->{{Treatment/Body
|distribution=Alta.;B.C.;Greenland;Nfld. And Labr. (Nfld.);Man.;N.S.;N.W.T.;Nunavut;Ont.;Que.;Yukon;Mont.;Wyo.;Colo.;N.Mex.;Wash.;Idaho;Mich.;Alaska;Oreg.;Nev.
|discussion=<p><i>Elymus alaskanus</i> extends across the high arctic of North America to extreme eastern Russia. This treatment interprets <i>E. alaskanus</i> as having relatively short glumes, in accordance with its treatment by Hulten (1968). Large specimens resemble <i>E. macrourus</i> (see previous), but differ in the shape of their glumes and in their wider glume margins. <i>Elymus alaskanus</i> differs from <i>E. trachycaulus</i> (p. 321) in its greater cold tolerance and the distal widening of its glume margins. There is some intergradation, particularly with <i>E. violaceus</i> (p. 324) and <i>E. trachycaulus</i>, but these species have longer glumes. Moreover, in western North America, <i>E. violaceus</i> is restricted to rocky habitats at or above treeline, whereas <i>E. alaskanus</i> is often associated with valleys and flat areas. Reports of its extending to New Mexico are based on the inclusion of high-elevation forms of <i>E. trachycaulus</i>.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Glumes glabrous, scabrous or sparsely hairy, hairs to about 0.2 mm long; lemmas glabrous or with hairs to about 0.2 mm long
|[[Elymus alaskanus subsp. alaskanus|Elymus alaskanus subsp. alaskanus]]
|-id=key-0-1
|1
|Glumes and lemmas densely hairy, hairs 0.2-0.5 mm long
|[[Elymus alaskanus subsp. hyperarcticus|Elymus alaskanus subsp. hyperarcticus]]
|}
</div></div><!--

-->{{#Taxon:
name=Elymus alaskanus
|author=
|authority=(Scribn. & Merr.) Á.Löve
|rank=species
|parent rank=genus
|synonyms=Roegneria villosa;Roegneria borealis;Elymus alaskanus subsp. borealis;Agropyron alaskanum
|basionyms=
|family=Poaceae
|distribution=Alta.;B.C.;Greenland;Nfld. And Labr. (Nfld.);Man.;N.S.;N.W.T.;Nunavut;Ont.;Que.;Yukon;Mont.;Wyo.;Colo.;N.Mex.;Wash.;Idaho;Mich.;Alaska;Oreg.;Nev.
|reference=None
|publication title=
|publication year=
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V24/V24_458.xml
|subfamily=Poaceae subfam. Pooideae
|tribe=Poaceae tribe Triticeae
|genus=Elymus
|species=Elymus alaskanus
}}<!--

-->[[Category:Treatment]][[Category:Elymus]]