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Perennial grass from rhizomes with numerous long shoots; stems erect, hollow, (60) 80-200 (250) cm tall.
Sheaths rough; blades 8-18 mm wide, 30-60 cm long, bright green, smooth below, rough above, with 2 pale brown, triangular spots at the base below, the upper leaves indistinctly cross-wrinkled; ligules 2.5-3.5 mm long, blunt at the tips, slightly jagged with a central spine-shaped tip, the tips 1-2 mm long.
Inflorescence a dense panicle, 10-40 cm long, with 4 to 10 branches at the central panicle nodes, the branches relatively thick, nearly erect to spreading, rough, with the main axis rough; spikelets 7- to 9-flowered, egg-shaped, green or tinged with yellow or violet, 2.5-6.5 mm long and up to about 2.5 mm wide; glumes nearly sharp-pointed, the lower ones 2-3 mm long, the upper ones 3-4 mm long; lemmas prominently 7-nerved, blunt, 2.5-4 mm long; paleas blunt, with wide V-shaped notches, 3-4 mm long, concealed by the lemmas; stamens 3; anthers 1-2 mm long.
Source: The Illustrated Flora of British Columbia