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Perennial, loosely to densely tufted grass from fibrous roots, sometimes with short rhizomes; stems 20-80 cm tall.
Sheaths smooth, the margins open about 1/10 their length; sterile shoots emerging mainly inside sheaths with tubular two-keeled buds protecting the scales; blades 1.5-5 mm wide, flat; ligules 0.5-2 mm long, the tips blunt, the backs smooth.
Inflorescence a lax panicle, 6-22 cm long, narrowly lanceolate, sparse, the branches 1 to 3 per node, ascending, lax, rough on angles; spikelets laterally compressed, 3.5-7 mm long, (1-) 2- (4-) flowered; lower glumes 1-nerved; rachilla internodes about 1 mm long, smooth, hairless; lemmas narrowly lanceolate, 3.2-5 mm long, the tips long-pointed, surface smooth, hairless, the lateral nerves moderately prominent; calluses sparsely cobwebby; palea keels smooth to rough; flowers bisexual; anthers 0.5-1.2 mm long.
Source: The Illustrated Flora of British Columbia