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General:
Perennial grass from scaly rhizomes; stems hollow, erect, nearly circular in cross-section, tapered to slightly flattened, often branching above, more or less short-hairy at and adjacent to the nodes, the internodes smooth and polished except near the tips, 30-110 cm tall.
Leaves:
Sheaths minutely rough, slightly keeled; blades flat, rough, minutely rough or occasionally smooth, 2-17 cm long, 2-5 mm wide; ligules membranous, finely jagged and fringed with fine hairs, squared-off at the tips, 0.6-1.5 (1.7) mm long.
Flowers:
Inflorescence a narrow, spikelike, contracted, densely flowered, lobed panicle, 0.8-16 cm long, 0.3-1.8 cm wide, the branches 0.2-2.5 cm long, tightly appressed; spikelets 1-flowered, often unstalked or short-stalked, glumes narrow, 1-nerved, smooth to minutely rough near the tips, nearly equal, (3) 4-7 (8) mm long, the tips long-pointed to slender awned, the awns equalling or longer than the bodies, 4-5 mm long, 1.3 to 2 times longer than the lemmas; lemmas lanceolate, soft-hairy in the lower half along midnerves and margins, minutely rough, unawned to awned, 2.2-3.8 mm long including the long-pointed or short-awned tips, the awns up to 1 mm long, the calluses short soft-hairy, the hairs 0.7-1.5 mm long; paleas lanceolate, loosely soft-hairy between nerves on the lower half, the tips long-pointed, 2.2-3.8 (4.5) mm long; anthers 0.4-0.7 mm long, yellowish.
Source: The Illustrated Flora of British Columbia
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