Rhizome neck 4–6 cm. Culms 6–10 m, 2–5 cm in diam.; internodes gray-green, terete, 28–33 cm, rigid, gray or gray-yellow setose below each node; wall 4–8 mm thick; nodes light yellow-green to purple, supra-nodal ridges weakly prominent; sheath scar weakly prominent, gray. Branches 6–13 per node; buds oblong to elliptic, margins gray-yellow ciliolate. Culm sheaths persistent, yellow-brown, narrowly triangular or narrowly rounded, much longer than internodes, leathery, sparsely appressed yellow or yellow-brown setose, longitudinal ribs very prominent, margins initially yellow ciliolate, apex triangular; auricles absent; oral setae absent or few, yellow-brown, curved; ligule truncate or convex, 1–6 mm; blade reflexed, curved, narrowly triangular or linear-lanceolate, margins rolled, serrulate. Leaves 3–6 per ultimate branch; sheath glabrous, sometimes distally white powdery; auricles absent; oral setae absent or few; ligule truncate or convex, ca. 1 mm; blade lanceolate, 6–12 × 1.3–2.2 cm, glabrous, secondary veins 4-or 5-paired, transverse veins distinct, base cuneate or broadly cuneate, margins spinescent-serrulate. Inflorescence unknown. New shoots Aug.
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