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

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Illustration Source:  The Illustrated Flora of British Columbia

Synonyms and Alternate Names:
Elymus calderi Barkworth