Amphibromus archeri

Tufted perennial, occasionally with swollen basal internodes; culms to 1.5 m high. Leaves glabrous, finely scabrous; blade flat to inrolled, to 35 cm long and 2.5–5 mm wide; ligule acute, 5–12 mm long. Inflorescence typically an open, spreading panicle, to 35 cm long. Spikelets 3–7-flowered, 12–18 mm long (excluding awns), green or purplish; glumes acute, the lower 3–5-nerved, 5–7 mm long, the upper 5–7-nerved, 6–9 mm long; lemma 6–9 mm long, smooth to tuberculate, apical teeth 4, usually purplish, the inner pair extended into bristles 2–4 mm long, the lateral pair with reduced bristles or bristles lacking; awn 13–18 mm long, inserted 30–45% of the lemma length from the apex, column 4.5–7 mm long; palea from one-half to three-quarters as long as lemma. Flowers Oct.–Jan.