Rhizome neck 3–11 cm. Culms 3–5 m, 1–2 cm in diam.; internodes terete or grooved above branches, 15–18 cm, initially densely white powdery, glabrous or gray-yellow setose below node; wall 2.5–6 mm thick; supra-nodal ridge level; sheath scar prominent. Branches 5–14 per node, deflexed; buds oblong, margins densely yellow-brown ciliate. Culm sheaths persistent, narrowly triangular, much longer than internodes, leathery, yellow-brown to brown setose, margins glabrous, longitudinal ribs prominent, apex narrowly triangular; auricles absent; oral setae absent or few; ligule truncate, ca. 1 mm, glabrous; blade reflexed, linear-lanceolate, glabrous, margins smooth, usually rolled. Leaves 3–5 per ultimate branch; sheath glabrous; auricles absent; oral setae few, deciduous, erect, yellow-brown, 1–2.5 mm; ligule arcuate, ca. 0.5 mm, glabrous; blade lanceolate, 6–14 × 0.6–1.35 cm, glabrous, secondary veins 3-or 4-paired, transverse veins distinct, base cuneate, apex long acuminate, one margin spinescent-serrulate, other margin obscurely so. Inflorescence unknown. New shoots Aug.
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