Rhizome neck 3–8 cm. Culms 3–6 m, 1.2–2.5 cm in diam.; internodes green, terete, 25–38 cm, waxy; wall 3–4 mm thick; supra-nodal ridges level or weakly prominent; sheath scar prominent, initially yellow-brown setulose. Branches 10–15 per node. Culm sheaths gradually deciduous, gray to gray-brown, narrowly triangular, ca. 4/5 as long as internodes, leathery, sparsely yellow clavate-setose, margins initially yellow ciliate, apex broadly triangular; auricles and oral setae absent; ligule purple, arcuate, ca. 1 mm, margins slightly undulate; blade erect, narrowly triangular, margins smooth, rolled. Leaves 2–4 per ultimate branch; sheath margins glabrous; auricles and oral setae absent; ligule purple, truncate; blade linear-lanceolate, 5–7.5 × 0.4–0.7 cm, glabrous, secondary veins 2-or 3-paired, transverse veins distinct, base cuneate, one margin serrulate, other margin obscure. Inflorescence unknown. New shoots Aug.
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