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Annual, tufted grass from fibrous roots; stems erect to decumbent, 15-45 (65) cm tall/long.
Sheaths smooth, occasionally with craterlike glands below the nodes, fringed with fine hairs at the summit, the hairs up to 5 mm long, the throats with hairs up to 2 mm long; blades (1) 5-20 cm long, (1) 3-5 (10) mm wide, flat to in-rolled, mostly smooth below, with craterlike glands along the margins, more or less rough above, occasionally hairy; ligules 0.4-0.8 mm long, fringed with fine hairs.
Inflorescence a congested to open, cylindrical to egg-shaped panicle, (3) 5-16 (20) cm long, 2-8.5 cm wide, tapered from the base upward, the branches 0.4-5 cm long, appressed to spreading 20-80degree from the stem axis; spikelets flattened, 6-20 mm long, 2-4 mm wide, 10- to 40-flowered, egg-shaped or lanceolate, greyish-green or translucent, the stalks with craterlike glands; glumes keeled, the keels with craterlike glands, nearly equal, 1.2-2.6 mm long, broadly egg-shaped to lanceolate, membranous, 1- or 3-nerved, the lower glumes 1.2-2 mm long, usually 1-nerved, the upper glumes 1.2-2.6 mm long, often 3-nerved; lemmas (1.8) 2-2.8 mm long, broadly egg-shaped, membranous, prominently nerved, the tips rounded to sharp-pointed, keeled, the keels with 2 to 5 craterlike glands; paleas 1.2-2.1 mm long, translucent, the tips rounded to sharp-pointed; stamens 3, anthers 0.2-0.5 mm long, yellow; caryopses 0.5-0.7 mm long, globe-shaped to elliptical, reddish-brown.
Source: The Illustrated Flora of British Columbia