Rhizome neck 2.5–12.5 cm, 0.6–1.8 cm in diam. Culms 3–5 m, 1–2 cm in diam.; internodes light green, terete, 13–16 cm, densely white powdery, glabrous, solid; supra-nodal ridges weakly prominent; sheath scar prominent, woody. Branches 4–9 per node, deflexed; buds oblong, basally white powdery, setulose, margins yellow-brown ciliate. Culm sheaths persistent, narrowly rounded-triangular, longer than internodes, leathery, appressed yellow setose, longitudinal ribs prominent, margins light yellow ciliate; auricles and oral setae absent; ligule arcuate, ca. 1 mm, glabrous; blade persistent, erect, green-purple, triangular or linear-triangular, glabrous. Leaves 3–5 per ultimate branch; sheath glabrous; auricles and oral setae absent; ligule arcuate, ca. 0.5 mm; blade narrowly lanceolate, 4–9.5 × 0.4–0.7 cm, glabrous, secondary veins 2–4-paired, transverse veins slightly distinct, base cuneate, one margin densely serrulate, other margin obscurely so, apex long acuminate. Inflorescence unknown. New shoots Jul.

* 2300–2500 m. W Yunnan.