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Annual grass from fibrous roots, usually basally-branched; stems 30-60 (100) cm tall.
Sheaths open; blades flat, (3) 4-10 mm wide, the margins somewhat unequally freed from the sheaths; ligules blunt to rounded, usually with deeply irregular, jagged margins, smooth externally, 4-8 mm long; ear-shaped lobes at the leaf-bases occasionally present, scarcely 0.3 mm long.
Inflorescence a dense, egg-shaped to cylindrical panicle, 1.5-3 (4) cm long; spikelets 6-8 mm long; glumes nearly equal, obliquely egg-shaped, with 3 greenish nerves, abruptly short sharp-pointed, strongly winged on the upper halves, the wings about 1 mm wide; sterile lemmas 2, finely hairy, the lower 2.5-3 mm long, the upper 3-3.5 mm long, both nearly 1 mm wide; fertile lemmas finely hairy, abruptly sharp-pointed, 5-5.5 (6) mm long; paleas nearly equal to the lemmas; lodicules absent; anthers 2.5-3 mm long.
Source: The Illustrated Flora of British Columbia