Rhizome neck 8–40 cm; internodes solid. Culms 3–4.5 m, 1–2 cm in diam.; internodes terete, 18–45 cm, longitudinally ribbed, initially white powdery, glabrous or initially white-gray setose; wall 2–4 mm thick; supra-nodal ridge weakly prominent; sheath scar prominent, initially slightly setose. Branches 3–7. Culm sheath deciduous, densely purple-brown spotted, triangularly narrowly rounded or narrowly triangular, ca. 1/2 as long as internodes, leathery, prominently longitudinally ribbed, sparsely yellow setulose, margins initially yellow-brown ciliolate; auricles absent, oral setae absent or 1, ca. 1 cm; ligule truncate, 1.5–4 mm; blade erect or reflexed, linear-triangular or triangular-lanceolate. Leaves 3–6 per ultimate branch; sheath margins initially ciliate; auricles absent; oral setae few, 1–5 mm; ligule truncate or arcuate, external ligule ciliate; blade narrowly lanceolate, 1.2–10.5 × 0.4–0.8 cm, glabrous, secondary veins 2–4-paired, transverse veins distinct, base cuneate, margins serrulate. Inflorescence unknown. New shoots Apr.
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