Culms 10–12 m, 4.5–6.5 cm in diam., basally flexuose, apically drooping; internodes slightly curved, 25–30 cm, very thinly white powdery, very sparsely stiffly hairy, with a ring of gray hairs below each node; wall thick; branching to base. Branches at lower nodes usually solitary, with tough, sharp thorns, at upper nodes 3 to several with central 3 longer and thicker. Culm sheaths tardily deciduous, with several marginal white stripes on each side, leathery, glabrous, apex obliquely truncate with unequal, triangular protuberance on each shoulder; auricles unequal, linear-lanceolate, small, usually wrinkled, abaxially hispidulous; oral setae well developed, 5–10 mm, undulate, hispidulous at base; ligule 5–7 mm, margin irregular, dentate, laciniate; blade erect, broadly lanceolate, abaxially glabrous, base nearly 1/2 width of sheath apex. Leaf blade lanceolate, 9.5–19 × 1.5–2 cm, abaxially pubescent, adaxially glabrous. Inflorescence unknown.
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