Rhizome neck 4–8 cm. Culms 4–8 m, 2–5 cm in diam.; internodes green, terete, 22–30 cm, white powdery in apical ring, glabrous; wall 2–4 mm thick; supra-nodal ridges level or weakly prominent; sheath scar weakly prominent to prominent. Branches 6–12 per node; buds elliptic or broadly elliptic, white powdery, margins light yellow ciliate. Culm sheaths persistent, yellow-brown, narrowly triangular or narrowly rounded, much longer than internodes, leathery, glabrous or apically sparsely brown setose, longitudinal ribs prominent, margins glabrous, apex triangular; auricles and oral setae absent; ligule truncate or convex, ca. 1 mm, glabrous; blade reflexed, linear-lanceolate or linear, articulate with sheath. Leaves 4–10 per ultimate branch; sheath glabrous; auricles absent; oral setae few, gray-yellow, curved; ligule arcuate or truncate, ca. 1 mm; blade lanceolate, 8.5–16.5 × 0.8–1.3 cm, glabrous, secondary veins 3–5-paired, transverse veins distinct, base cuneate, one margin spinescent-serrulate, other margin obscurely so, apex long acuminate. Inflorescence unknown. New shoots Aug.
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