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Perennial, caespitose, usually rhizomatous. Culms erect, 0.5–2 (–3) m high. Leaves: ligule 1–4 (–8) mm long, obtuse to truncate; blade 15–53 (–80) cm long, 5–23 mm wide, glabrous or with short hairs or scaberulous on both surfaces, with margins smooth to scabrous. Panicles 7.5–42 cm long; primary branches ± scabrous. Spikelets disarticulating, 3.7–5 (–6.4) mm long; pedicel smooth to scaberulous. Sterile florets: lemma narrowly triangular to lanceolate, 1–1.8 mm long, acute to acuminate; midnerve and often margins scaberulous. Bisexual floret: lemma oblong to ± elliptic-obovate, 3.5–4.5 (–6.2) mm long, awned, coriaceous to cartilaginous, prominently 5-nerved; lemma awn 4–28 mm long, basally flattened; palea 3.5–5.1 mm long, with awn 0.5–1 mm long; anthers 1.4–2.8 mm long; stigmas blackish purple. Caryopsis ellipsoid or obloid, laterally compressed, 2.3–4.4 mm long.
A grass. It keeps growing from year to year. It can be erect or creeping and forming roots at the nodes. It grows 1.5-3 m tall. The stems are 7-10 mm across. The leaf blade is 30-50 cm long by 2-3 cm wide.
