Rhizome neck more than 15 cm; internodes solid. Culms 3–4.5 m, 0.5–1.2 cm in diam.; internodes terete, 16–24 cm, longitudinally ribbed, flattened above branches, initially densely waxy, white powdery, glabrous; wall 1.5–2 mm; supra-nodal ridge weakly prominent; sheath scar prominent. Branches 3–6. Culm sheath deciduous, triangular-rectangular, longer than internode, thinly leathery, with sparse adnate light yellow or yellow-brown setae, apical margins densely yellow-brown setulose, longitudinal ribs greatly prominent; auricles absent; oral setae present initially; ligule convex, irregularly fissured, initially ciliate; blade linear-triangular or linear-lanceolate, glabrous, revolute. Leaves 5–7 per ultimate branch; sheath glabrous; auricles absent, oral setae absent or present initially; ligule truncate, glabrous; blade lanceolate, 7–14 × 1–1.6 cm, glabrous, secondary veins 4- or 5-paired, transverse veins well-defined, one margin serrulate, other obscurely so. Inflorescence unknown. New shoots Apr.

* 2100–2400 m. E Guizhou.