Culms 5–8 m, 2–5 cm in diam.; internodes terete, 12–29 cm, initially white powdery, later gray-green, glabrous; nodes prominent, slightly pubescent. Culm sheaths longer than internode, thinly leathery, striate, sparsely, glossy-tawny hairy, distally attenuate and triangular, apex centrally strongly convex or projected, slightly projected on 2 sides, apex 2–4 cm wide; auricles tiny; oral setae several, long; ligule 3–13 mm; blade lanceolate, 4–16 × 1–1.5 cm. Leaves 5 or 6 per ultimate branch; sheaths glabrous; auricles absent or tiny; oral setae 1 or 2; ligule truncate, ca. 1.5 mm; blade linear-lanceolate, 10–13 × 0.8–1.5 cm. Inflorescence and caryopsis unknown. New shoots Jun–Jul.
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