Culms to 20 m, 1.5–3 cm in diam.; internodes 40–70 (–120) cm, initially hispid; wall 4–10 mm thick; nodes flat, each with a brown tomentose ring below. Branches several, main mid-culm ones to 6 m. Culm sheaths dark brown, 24–38 cm, leathery, with appressed, minute, yellow spiny hairs, apex with thin projections 1–2 cm on each side; auricles absent; ligule depressed, ca. 1 mm; blade erect, linear-lanceolate, base articulate. Leaf sheaths glabrous; auricles absent; ligule ca. 1 mm; blade oblong-lanceolate, 20–40 × 3–9 cm. Inflorescence unknown.
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