Rhizome neck 6–13 cm. Culms 3–4 m, 5–8 mm in diam., middle and upper part of culm pendulous or scrambling; internodes terete, 20–33 cm, white powdery, initially gray to gray-brown setose, longitudinal ribs greatly prominent, solid or nearly so, supra-nodal ridges prominent; sheath scar prominent to greatly prominent, initially setose. Branches 3–5 per node. Culm sheaths persistent, triangularly narrowly rounded, shorter than internodes, leathery, glabrous or sparsely yellow-brown setose, longitudinal ribs very prominent, margins densely yellow-brown setulose; auricles absent; oral setae present; ligule purple, truncate, 1–2 mm, glabrous, fissured; blade reflexed, linear, glabrous, margins initially serrulate, usually rolled when dry. Leaves 3–5 per ultimate branch; sheath margins initially ciliate; auricles absent; oral setae few, readily deciduous, erect, yellow; ligule truncate, glabrous; blade narrowly lanceolate, 8–12 × 0.7–1.1 cm, abaxially proximally pubescent, secondary veins 3-or 4-paired, transverse veins distinct, base broadly cuneate, margins serrulate, apex acuminate. Inflorescence unknown. New shoots Aug–Sep.
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