Bromus carinatus Hook. & Arn.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Coarse, tufted, rather short-lived perennial 3–12 dm, often fl the first season, glabrous or hairy; blades flat and broad, 3–9 mm wide; ligule 1–3(–4) mm; panicles 10–20+ cm, loosely contracted, often nodding; spikelets 20–30(–40) mm, 5–10-fld, strongly compressed; glumes lanceolate, acute, strongly keeled, the first 7–11 mm, 3- or 5-veined, the second 9–13 mm, 5- or 7-veined; lemmas 11–15(–17) mm, keeled, ca 7-veined, soon spreading and exposing the elongate (2.5–5 mm) joints of the rachilla; awns (3–)4–(–8) mm; palea nearly as long as the lemma; 2n=28, 42, 56, 70. Moist open places; native to the w. cordillera, and casually intr. e. to Io. and Ill. (B. marginatus)