Rhizome neck 3–6 cm. Culms 3–5 m, 1–2 cm in diam.; internodes terete, 25–35 cm, initially distally white-gray setose; wall 2.5–5 mm thick; supra-nodal ridges weakly prominent; sheath scar prominent, with persistent remains of sheath base, glabrous or initially sparsely white-gray setose. Branches many per node, deflexed, subequal. Culm sheaths persistent, gray-red-brown, narrowly triangular, shorter than internode, thickly papery, densely appressed brown to dark brown setose, longitudinal ribs distally prominent, margins brown ciliate, apex triangular; auricles triangular or absent; oral setae several, gray, 2–5 mm; ligule arcuate, 2–6 mm, ciliate; blade erect, linear-lanceolate, glabrous, margins rolled. Leaves 2–6 per ultimate branch; sheath margins glabrous; auricles absent; oral setae few, gray, 3–5 mm; ligule brown, truncate or arcuate, glabrous; blade narrowly lanceolate, 9–13 × 0.5–1 cm, thin, abaxially gray-puberulous proximally, secondary veins 4-paired, transverse veins obscure, base cuneate, margins serrulate, apex acuminate. Inflorescence unknown. New shoots Jun.
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