Culms 6–10 m, 2.5–3.5 cm in diam., apically suberect; internodes 50–60 cm, initially thinly white powdery, glabrous; wall rather thin; nodes flat, basal node with a ring of gray-white silky hairs below and above sheath scar, 2nd node with a ring of gray-white silky hairs above sheath scar; branching from 4th to 6th node up. Branches many, clustered, central slightly longer and thicker. Culm sheaths deciduous, thickly leathery, rigid, glossy, glabrous, apex slightly asymmetrically arched; auricles unequal, minutely wrinkled with obtuse ends; larger auricle oblanceolate, ca. 1.5 × 0.5 cm; smaller auricle usually pressed against blade base and wrinkled, or narrowly obovate, ca. 2/5 size of larger one; oral setae dense, deciduous, curved; ligule 2–3 mm, dentate, fringed or glabrous; blade persistent, erect, asymmetrically ovate-triangular to narrowly ovate-triangular, base slightly rounded and joined with auricles for ca. 5 mm, ca. 4/5 width of sheath apex, apex subulate, acuminate. Leaf blade linear-lanceolate to lanceolate, 8–16(–20) × 1.2–1.6(–2) cm, abaxially densely villous, adaxially glabrous. Inflorescence unknown.
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