Culms robust, solitary or tufted, stiff, erect or climbing, 1–1.5(–3) m, 4–5-noded, unbranched. Leaf sheaths smooth, usually shorter than internodes; leaf blades 10–50 × 1–3 cm, smooth or scabrous, abaxial (upper) surface dark green, adaxial (lower) surface whitish, apex acuminate; ligule 5–15(–25) mm, scabrous. Panicle 15–40 cm, branches 5–10 cm, widely spreading at maturity. Spikelets narrowly elliptic-oblong at first, gaping at maturity, 4–4.5 mm, glossy; lower glume ca. 1/2 spikelet length, 1–3-veined; upper glume as long as spikelet, 3–5-veined; lemma narrowly ovate, apex obtuse. Anthers 1.5–2 mm. Caryopsis black-brown, 2.5–3 mm wide, rugose. Fl. and fr. May–Sep.
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