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Annual, freely branching grass from fibrous roots, also rooting at the nodes, forming patches often over 1 m wide; stems hollow, often prostrate to ascending, 20-60 cm long/tall.
Sheaths and collars strongly stiff-hairy, the hairs minutely blistery at the bases, often 2-3 (5) mm long; blades 4-6 (10) mm wide, flat, at least stiff-hairy towards the base, usually rough on the lower surface, the free margins narrowed gradually and ultimately turning upward on the ligules as slight ridges; ligules 1.5-2 mm long, membranous, blunt, the margins irregularly jagged.
Inflorescence of several, fingerlike, linear racemes in 1 or 2 whorls, 5-12 cm long, the spikelets mostly paired and in 2 rows on 1 side of flattened and 3-angled rachises; spikelets 2-flowered, but the lower flowers sterile, 1 spikelet short-stalked, the other nearly unstalked; glumes fringed with short hairs, the lower glumes about 0.5 mm long, the upper glumes about 2 mm long; sterile lemmas equalling the fertile lemmas, about 3 mm long, appressed-hairy, the lateral nerves prominent; lemmas pale greenish-brown.
Source: The Illustrated Flora of British Columbia