Culms 2–5 m tall, 1–2.5 cm in diam.; internodes green, slightly 4-angled or terete, 10–15 cm, initially densely white pubescent and sparsely setose, remaining verrucose; nodes very prominent; sheath scar usually with a ring of hazel cilia or persistent culm sheath base, basal node with a ring of 9–14 root thorns. Culm sheaths fulvous, shorter than internodes, prominently ridged with purple veinlets; ligule truncate or arched, minutely ciliate; blade subulate-triangular, 3–5 mm. Leaves 1–3(or 4) per ultimate branch; sheaths glabrous or initially ciliate; oral setae 3–5, erect, pale, 3–5 mm; ligules arched, minute; leaf blade linear-lanceolate to linear, 6–15 × 0.5–1.2 cm, papery, glabrous, secondary veins 3-or 4-paired. Inflorescence unknown. New shoots Aug–Sep.
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