Rhizome neck 3–4.5 cm, 1.3–3 cm in diam., internodes 2–6 mm, initially densely white-gray ciliolate. Culms 2–6 m, 1–3.5 cm in diam., hollow; internodes terete, 17–28 cm; longitudinal ridges prominent, initially glaucous and densely white powdery, especially in apical ring; wall 2–3 mm thick; nodes prominent; sheath scar prominent, with persistent remains of sheath base. Branches many. Culm sheaths yellow-brown when dry, rectangular, leathery, glabrous, distal margins densely yellow ciliolate, apex asymmetrical; auricles and oral setae absent; ligule truncate or inclined, ca. 1 mm, not ciliolate; blade reflexed, linear-lanceolate, white-gray setose. Leaves 3 or 4 per ultimate branch; sheath glabrous; auricles and oral setae absent; ligule usually purple, arcuate, ca. 1 mm, glabrous; blade lanceolate, 2–12.5 × 0.3–1.9 cm, abaxially slightly scabrous, secondary veins 3-or 4-paired, transverse veins undeveloped, base rounded or broadly cuneate, margins spinescent-serrulate. Inflorescence unknown. New shootsApr–May.
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