Bromus catharticus

Tufted annual, biennial or perennial, culms erect, to 120 cm high. Leaves glabrous to pilose; blade loosely folded, to 45 cm long and 15 mm wide, scabrous; ligule glabrous, truncate, 1–5 mm long. Inflorescence a panicle to 40 cm long. Spikelets compact, 4–9-flowered, lanceolate to oblong, 10–40 mm long; with florets strongly imbricate and usually strongy laterally compressed; lower glume 3–7-nerved, 8–15 mm long, upper glume (5–)7–9-nerved, 10–18 mm long; lemma 8–24 mm long, including awn, if present, to 10 mm long, strongly keeled, scabrous along keel.