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Perennial, loosely tufted grass from fibrous roots and long rhizomes or with isolated shoots; stems 50-120 cm tall.
Sheaths usually rough, the projections pointed downward, the margins open 1/4-1/2 their length; blades 3-6 mm wide, flat, narrowly prow-tipped; ligules 2-3.5 mm long, the backs smooth or slightly rough.
Inflorescence a panicle, 14-30 cm long, open, sparse, the branches mostly 1 to 2 per node, widely spreading, the longest 5.5-12 cm long, slightly to moderately rough-angled; spikelets laterally compressed, 4-8 mm long, 2- to 4-flowered; lower glumes 1- to 3-nerved; rachilla internodes about 1 mm long, smooth, hairless; lemmas lanceolate, 3.2-6 mm long, the tips sharp-pointed, surface smooth or sparsely rough, the keels and marginal nerves sparsely short silky-hairy, lateral nerves rarely sparsely, minutely soft-hairy and moderately prominent, hairless between the nerves; calluses cobwebby; palea keels more or less rough, hairless; flowers bisexual, normal (rarely bulbiferous); anthers 0.5-1.1 mm long.
Source: The Illustrated Flora of British Columbia