Culms to 10(–15) m, to 10 cm in diam.; internodes deep green, 35–45(–55) cm, initially thinly white powdery, sparsely deciduously white hairy; wall to 2 cm thick; nodes flat, white tomentose; branching from basal nodes up. Branches many, main mid-culm branch to 2 cm in diam. Culm sheaths deciduous, ca. 1/2 as long as internodes, leathery, with yellow and brown hairs, apex truncate or slightly concave; auricles small; oral setae several; ligule 2–3 mm, fimbriate; blade reflexed or spreading, abaxially glabrous, base ca. 1/3 as wide as sheath apex. Leaf sheaths glabrous; ligule truncate; auricles narrowly ovate; oral setae deflexed; blade lanceolate, 7–18 × 1–2.5 cm. Pseudospikelets 2–4 cm; gemmiferous bracts progressively larger; florets 7–11. Glumes 1 or 2; lemma 0.7–1 cm; palea longer than lemma, narrow, apex obtuse; lodicules 3. Anthers 4–5 mm. Ovary pubescent at apex; stigmas 3. Caryopsis unknown.
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