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Annual tufted grass (rarely longer-lived), from fibrous roots, sometimes from stolons; stems 2-20 (45) cm tall.
Sheath margins open about 2/3 their length; sterile shoots emerging inside sheaths with indistinct, two-keeled buds protecting the scales; blades 1-3 mm wide, flat, thin; ligules 0.5-3 mm long, the backs smooth, hairless.
Inflorescence an erect panicle, 1-10 cm long, 1.2-1.6 times longer than wide, the branches 1 to 2 (3) per node, ascending to spreading or reflexed; spikelets laterally compressed, 3-5 mm long, 2- to 6-flowered; lower glumes 1-nerved; rachillas smooth, hairless, more or less concealed, terminal internodes less than 1/2 (3/4) length of terminal lemmas; lemmas lanceolate, 2.5-4 mm long, the tips rounded to sharp-pointed, surface smooth, keel, marginal, and often lateral nerves silky- to minutely crisply- or soft-hairy (rarely hairless throughout), lateral nerves moderately prominent; calluses hairless; palea keels silky-hairy; flowers bisexual, or the upper ones in a spikelet female; anthers 0.6-1.1 mm long, cylindrical prior to opening.
Source: The Illustrated Flora of British Columbia