View source for Elymus semicostatus

{{Treatment/ID
|accepted_name=Elymus semicostatus
|accepted_authority=(Nees ex Steud.) Melderis
|publications=
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Agropyron semicostatutn
|authority=unknown
}}
|hierarchy=Poaceae;Poaceae subfam. Pooideae;Poaceae tribe Triticeae;Elymus;Elymus semicostatus
|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 semicostatus]]</div></div>
|volume=Volume 24
|mention_page=
|treatment_page=page 338
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>cespitose, not rhizomatous. <b>Culms</b> 45-135 cm, erect or geniculately ascending, glabrous. <b>Sheaths</b> glabrous or villous; auricles to 1.5 mm; ligules 0.5-1.5 mm, truncate; blades 15-30 cm long, 4-12 mm wide, sometimes villous, adaxial surfaces smooth or scabrous, primary and secondary veins alternating. <b>Spikes</b> 8-30 cm long, 1-2 cm wide including the awns, 0.5-1 cm wide excluding the awns, erect or nodding, usually with 1 spikelet per node, sometimes with 2 spikelets at the lower nodes; internodes 10-20 mm long, about 0.8 mm wide, scabrous on the margins and on the surfaces, marginal prickles larger than those on the surfaces, hirtellous just below the spikelets. <b>Spikelets</b> 16-30 mm, loosely appressed, with 6-8 florets; rachilla internodes about 0.8 mm, strigose, hairs to about 0.3 mm; disarticulation above the glumes, beneath each floret. <b>Glumes</b> subequal, 10-18 mm long, 1.1-2 mm wide, elliptic-lanceolate, green, not keeled, 5-7-veined, veins more or less equally prominent, scabrous, apices acute to acuminate; lemmas 10-14 mm, scabrous or puberulent dorsally, awned, awns (4)12-18 mm, straight; paleas 3/4 as long as to slightly shorter than the lemmas, keels outwardly curved below the apices, apices 0.3-0.7 mm wide, truncate; anthers 3-6 mm. <b>2n</b> = 28.</span><!--

-->{{Treatment/Body
|distribution=Oreg.;Ga.
|discussion=<p><i>Elymus semicostatus</i> is native to central Asia, from Afghanistan through Pakistan to northeastern India (Sikkim). Reports of its presence in the Flora region appear to be based on misidentifications.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Elymus semicostatus
|author=
|authority=(Nees ex Steud.) Melderis
|rank=species
|parent rank=genus
|synonyms=Agropyron semicostatutn
|basionyms=
|family=Poaceae
|distribution=Oreg.;Ga.
|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_478.xml
|subfamily=Poaceae subfam. Pooideae
|tribe=Poaceae tribe Triticeae
|genus=Elymus
|species=Elymus semicostatus
}}<!--

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