Rhizome neck 20–55 cm. Culms 3–4 m, 5–10 mm in diam.; internodes terete, 24–43 cm, initially white powdery, glabrous, solid or nearly so; supra-nodal ridges level or prominent, initially white powdery; sheath scar prominent, initially purple and white-gray setose, becoming light yellow-brown and glabrous. Branches 3–45. Culm sheaths persistent, triangularly narrowly rounded, 1/3–1/2 as long as internodes, leathery, prominently longitudinally ribbed, abaxially glabrous or gray setose, adaxially waxy, margins glabrous or initially ciliolate; auricles absent; oral setae absent to 2, gray, 1–8 mm; ligule truncate or convex, ca. 0.5 mm, glabrous; blade reflexed, linear-lanceolate, glabrous. Leaves 3–6 per ultimate branch; sheath initially slightly hairy; auricles absent; oral setae 3–5, yellow, 1.5–4.5 mm; ligule truncate, glabrous; blade lanceolate, 4.5–13 × 0.8–1.3 cm, glabrous, secondary veins 3-or 4-paired, transverse veins distinct, base broadly cuneate or nearly rounded, margins serrulate. Inflorescence unknown. New shoots Aug.
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