Rhizome neck 6–23 cm. Culms 3–5 m, 1–1.5 cm in diam.; internodes terete, 21–30 cm, initially white powdery, glabrous; wall 1.5–2.5 mm thick; supra-nodal ridges level or weakly prominent; sheath scar prominent, narrow, thin. Branches 10–18 per node, deflexed, subequal. Culm sheaths deciduous, narrowly triangular, shorter than internode, proximally leathery, distally papery, sparsely appressed gray-yellow or yellow setose, margins glabrous, apex narrowly triangular; auricles absent; oral setae absent or several, gray, 3–6 mm; ligule purple, triangular or truncate, ca. 0.5 mm, glabrous; blade erect, triangular or linear-lanceolate, glabrous. Leaves 7–9 per ultimate branch; sheath to 28 cm, margins glabrous, apex narrowly triangular; auricles absent; oral setae few, gray, 2–5 mm; ligule truncate, glabrous; blade narrowly lanceolate, 5–13 × 0.5–1.1 cm, abaxially gray puberulous proximally, secondary veins 3-or 4-paired, transverse veins distinct, base cuneate, one margin serrulate, other margin obscurely so, apex acuminate. Inflorescence unknown. New shoots Sep.
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