Culms to 20 m, 10–15 cm in diam.; internodes 35–46 cm; wall ca. 2 cm thick. Branches several, central branch dominant. Culm sheaths deciduous, yellow-green when dry, leathery; auricles absent; ligule ca. 3 mm, serrulate; blade erect. Leaf sheaths glabrous, margin ciliate; ligule 1.5–2 mm; auricles small; blade 18–25 × 3–4.2 cm. Pseudospikelets 6–14 per node, clusters 1–1.5 cm in diam. Spikelets 10–13 × 3–4 mm; florets 4. Glumes 1 or more, 8–10 × 6–8 mm, long mucronate; lemma 1–1.2 cm, long mucronate; palea 7–9 mm. Anthers yellow or purple. Style 6–7 mm; stigma 1. Fruit unknown.
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