Rhizome neck 2.5–9 cm. Culms 3–4 m, 1–2 cm in diam.; internodes terete, 22–32 cm, initially densely white powdery, glabrous, longitudinal ribs obscure; wall 3–5 mm thick; supra-nodal ridges prominent; sheath scar prominent to very prominent. Branches 5–15 per node; buds oblong, pubescent, margins light yellow ciliate. Culm sheaths persistent or gradually deciduous, purple-brown, narrowly triangular, shorter than internodes, proximally leathery, distally papery, glabrous or sparsely brown setulose, longitudinal ribs prominent, margins glabrous; auricles and oral setae absent; ligule truncate, ca. 1 mm, glabrous; blade reflexed, linear-lanceolate, articulate with sheath. Leaves 4–7 per ultimate branch; sheath glabrous; auricles absent; oral setae few, erect, yellow-brown; ligule truncate, ca. 1 mm; blade narrowly lanceolate, 10–12.5 × 0.7–0.9 cm, abaxially proximally white-gray pubescent, secondary veins 3- or 4-paired, transverse veins distinct, base cuneate, margins spinescent-serrulate. Inflorescence unknown. New shoots Aug.

* 1400–1500 m. W Sichuan.