Rhizome neck 4.5–20 cm; internodes solid. Culms 1–2.5 m, 4–6 mm in diam.; internodes terete, 20–30 cm, glabrous, initially with white powdery ring below nodes, nearly solid; supra-nodal ridges level; sheath scar prominent. Branches 1–6 per node. Culm sheaths persistent, narrowly rounded, ca. 1/5 as long as internodes, leathery, slightly prominently longitudinally ribbed, glabrous or basally yellow-brown setose, margins densely brown-ciliolate; auricles absent; oral setae few, deciduous; ligule truncate, ca. 0.5 mm, glabrous; blade deflexed or erect, linear-triangular or linear-lanceolate. Leaves 2–6 per ultimate branch; sheath glabrous; auricles absent; oral setae 7–9, yellow, 2–3 mm; ligule truncate or convex, external ligule initially gray-puberulous; blade linear-lanceolate, 4–14.5 × (0.6–) 0.9–1.3 cm, glabrous or abaxially proximally sparsely setose, secondary veins 3- or 4-paired, transverse veins distinct, base cuneate, one margin serrulate, other margin smooth. Inflorescence unknown. New shoots Aug–Sep.

* About 2000 m. S Yunnan.