Rhizome neck 2–5 cm, 1–1.7 cm in diam., solid. Culms 1.5–2 m, 5–10 mm in diam.; internodes cylindrical, (4–)13–15(–18) cm, glabrous; wall 1.8–3 mm thick; supra-nodal ridge prominent; sheath scar prominent. Branches 13–33 per node, ascending, subequal; buds 5–7, suborbicular. Culm sheaths persistent, purple, linear-triangular, longer than nodes, thinly leathery or thickly papery proximally, membranous distally; auricles and oral setae absent; ligule 1–2 mm, initially fimbriate; blade erect, linear, glabrous, involute. Leaves 4 or 5 per ultimate branch; sheath glabrous; auricles and oral setae absent; ligules triangular-arcuate, 1–1.5 mm; blade linear-lanceolate, 4–9 × 0.3–0.6 cm, glabrous, secondary veins 2(or 3)-paired, transverse veins slightly distinct, base cuneate, margins serrulate. Inflorescence unknown.
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