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General:
Perennial grass from rhizomes; stems 20-75 cm tall, erect, the nodes exposed, smooth.
Leaves:
Sheaths smooth; blades 1.5-3 mm wide, flat or in-rolled when dry, mostly basal; ligules 0.5 mm long, finely jagged-edged; ear-shaped lobes at the leaf-bases 0.5-1 mm long.
Flowers:
Inflorescence a spike 4-10 cm long, erect; spikelets solitary at each node; glumes lanceolate, flat, tapered from middle to sharp point, 5-7 mm long, densely hairy; lemmas 8-11 mm long, densely hairy with hairs less than 1 mm long, tips sharply pointed; paleas keeled, with few to many hairs below, rough above; anthers 2.5-4 (5) mm long.
Notes:
Elymus x yukonensis, as represented by the type specimen, is probably a hybrid and is infrequent (M. Barkworth, pers. comm.) in AK and YT. The more common taxon in AK and YT, E. calderi, has a different type and thus most plants have been incorrectly named E. yukonensis or Agropyron yukonense.
Source: The Illustrated Flora of British Columbia
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