Culms 7–15 m, 6–8 cm in diam.; internodes 26–34 cm; wall 1.4–2.8 cm thick. Branches several, main mid-culm ones 3. Culm sheaths deciduous, thickly papery to leathery, abaxially yellow hispid or glabrous, apex slightly arched; auricles absent; ligule ca. 2 mm; blade erect. Leaf sheaths glabrous, margins ciliate; ligule ca. 1 mm; blade narrowly lanceolate, (5–)14–17 × 0.8–1.6 cm. Pseudospikelets subtended by 1–5 bracts, 8–16 mm; fertile florets 3 or 4. Glumes 1 or 2, 5–7 mm, margins ciliate; lemma 7–13 mm, apex mucronate; palea 6–14 mm. Anthers yellow, 4–6 mm. Pistil 1.3–1.7 cm; stigma 1. Fruit unknown.
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