Perennial, with creeping stolons, base brown, covered by dry leaf sheaths. Plants 20–100 cm tall, nodes pubescent. Leaf sheaths smooth, glabrous; leaf blades flat, ca. 15 cm, scabrid, glabrous or scattered pubescent; ligule ca. 0.5 mm. Panicle 8–15(–20) cm, erect, narrow, contracted, sometimes nodding; branches shorter than spikelets, each bearing 1 or 2 spikelets. Spikelets narrowly oblong, 15–25 mm, purple, florets 4–8; rachilla thinly hairy; glumes glabrous, lower glume 6–8 mm, 1- or 3-veined, upper glume 7–10 mm, 3-veined; lemmas lanceolate, 10–12 mm, 5–7-veined, marginal veins densely pubescent to middle or slightly above, midrib and intermediate veins pubescent or scabrid; awn 1–5 mm; palea shorter than lemma, keels ciliate. Anthers 2–4 mm. Fl. and fr. Jun–Aug.