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Annual, tufted grass from fibrous roots; stems erect to decumbent, much branched, smooth, 10-45 cm tall.
Sheaths sometimes glandular on midrib, fringed with fine hairs at summit, the hairs up to 4 mm long, the throats sparingly soft-hairy, loose, shorter than the internodes; blades 1.5-10 cm long, 1-3 (4) mm wide, flat, smooth with an occasional white hair, the margins sometimes with craterlike glands; ligules 0.2-0.5 mm long, fringed with fine hairs.
Inflorescence an open to condensed, egg-shaped panicle, 4-20 cm long, 2.2-8 (10) cm wide, the branches 0.5-6 cm long, spreading 20-100degree from the stem axis, sometimes with glandular areas of spots or craterlike glands on the rachis; spikelets 4-7 (11) mm long, (1.1) 1.5-2.2 mm wide, 7- to 12- (20-) flowered, flattened, narrowly egg-shaped, stalked, the stalks with craterlike glands, reddish-purple to greenish, occasionally greyish; glumes 0.9-1.6 mm long, subequal, broadly egg-shaped, membranous, pointed, keeled, the keels with craterlike glands, the lower glumes 0.9-1.4 mm long, the upper glumes 1.2-1.6 mm long; lemmas 1.3-2 (2.2) mm long, broadly egg-shaped, membranous, the tips sharp-pointed to rounded, with prominent lateral nerves, keeled, the keels occasionally with 1 or 2 craterlike glands; paleas 1.3-1.7 mm long, translucent, the tips rounded to sharp-pointed; stamens 2, anthers 0.2-0.3 mm long, reddish-brown; caryopses 0.5-1.1 mm long, pear-shaped, both ends rounded, smooth or faintly lined, brownish.
Source: The Illustrated Flora of British Columbia