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Perennial grass from fibrous roots, rhizomes and stolons; stems erect or decumbent, 7-30 cm tall, about 0.5 mm wide.
Sheath margins open 1/3-2/3 their length; sterile shoots slender, tufted; blades 0.5-1.5 mm wide, in-rolled, mostly threadlike, moderately thick, outer surface smooth, inner surface of blades of sterile shoots usually distinctly rough or minutely soft-hairy; ligules 0.5-2 mm long, the tips blunt to sharp-pointed, backs rough.
Inflorescence an erect panicle, 1-5 cm long, moderately congested, loosely contracted, the branches 1 to 2 per node, sparsely to distinctly rough; spikelets laterally compressed, 3-8 mm long, 2- to 5-flowered; glumes unequal, the lower ones 2.5-3 mm long, 1- to 3-nerved, the upper ones 3-4 mm long; rachillas hairless or sparsely minutely soft-hairy; lemmas lanceolate, 2.5-4 (4.5) mm long, the tips sharp-pointed, surface finely rough, hairless, or keel and some marginal nerves sparsely minutely soft-hairy below; calluses hairless or diffusely, shortly, sparsely cobwebby; palea keels rough; flowers of different plants female, male or all or partially bisexual (mixed female and bisexual); anthers vestigial or 1.5-2 mm long.
Source: The Illustrated Flora of British Columbia