Culms 4–5 m tall, 2–4 cm in diam.; internodes slightly 4-angled, 11–13 cm; supra-nodal ridges strongly elevated, lower nodes each with a ring of 4–19 root thorns; sheath scars purple pubescent, with persistent culm sheath base. Culm sheaths deciduous, initially dark purple, later becoming fulvous with pale green or white stripes, longer than internodes, papery, distally corrugated, veinlets distinct and purple; ligule arched, minute; blade subulate. Leaves 4–6(–9) per ultimate branch; oral setae deciduous, erect, pale, 3–5 mm; ligule arched, ciliate; petiole short, densely pubescent; blade elliptic-lanceolate, 8–17 × 0.8–2 cm, adaxially sparsely pubescent, densely so at base, secondary veins 4–6-paired, veinlets obvious. Inflorescence unknown. New shoots Oct.
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