Culms 5–10 m, 4–4.5 cm in diam., apically slightly drooping; internodes 35–50 cm, basal internodes swollen on alternate sides, initially thinly white powdery, stiffly dull brown hairy; wall slightly thin; nodes flat, basal 3 usually with rings of gray-white silky hairs above sheath scar, higher nodes initially with white powdery rings, sometimes also with rings of gray-white silky hairs below sheath scar; branching from 8th to 10th node up. Culm sheaths deciduous, leathery, rigid, usually sparsely stiffly dull brown hairy toward inner margin, apex slightly slanted at outer side, subtruncately broadly arched; auricles ascending, unequal, slightly wrinkled, larger one suboblong, ca. 8 × 6 mm, ends exserted beyond margin, smaller auricle subelliptic, 1/4–1/3 size of larger one, usually partly covered by blade base; oral setae fine, undulate; ligule 2–3 mm, finely dentate, shortly fringed at both sides; blade erect, slightly asymmetrical, triangular to narrowly triangular, base rounded, joined to auricles for 2–3 mm, ca. 3/4 × as wide as sheath apex, abaxially glabrous, adaxially scabrous. Leaf blade linear, 9–17 × 1.2–2 cm, abaxially densely pubescent, adaxially glabrous. Inflorescence unknown.
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