Rhizome neck 5–10 cm, 1.5–2 cm in diam. Culms slightly zigzag, 3–6 m, 1.5–3 cm in diam.; internodes gray-green, terete, 22–25 cm, initially white powdery and white-gray setose, initially densely yellow setose below node, longitudinal ribs prominent; wall 3–5 mm thick; supra-nodal ridges weakly prominent to prominent; sheath scar prominent. Branches 3–7 per node, erect or deflexed. Culm sheaths deciduous, triangularly narrowly rounded or narrowly triangular, longer than internodes, leathery, sparsely yellow adnate-setulose, setae erect and long, longitudinal ribs prominent, margins glabrous or yellow-brown ciliate, apex broadly triangular; auricles and oral setae absent; ligule truncate or convex, 1–2 mm, glabrous; blade readily deciduous, reflexed, triangular or linear-lanceolate, glabrous. Leaves 3–5 per ultimate branch; sheath 5–6.6 cm, margins glabrous; auricles absent or obscure; oral setae few, divergent, yellow-brown, 1.5–3 mm; blade lanceolate, 12–16 × 2–3 cm, thin, usually rugose when dry, glabrous, secondary veins 4-or 5-paired, transverse veins slightly distinct, base cuneate or broadly cuneate, one margin spinescent-serrulate, other margin obscurely so. Inflorescence unknown. New shoots Sep.
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