Culms 6–10 m, 25–40(–60) mm in diam.; internodes 30–45 cm; wall thin. Branches several. Culm sheaths deciduous, leathery, abaxially striate, appressed brown setose; auricles absent; ligule fimbriate or ciliate; blade reflexed, lanceolate. Leaf sheath abaxially striate; ligule long, ciliate; blade variable in size, 19–24(–40) × 2.5–3.5(–10) cm. Inflorescence semelauctant, paniculate. Spikelets 2–3 cm; florets 4–7, apical one sterile with a reduced rachilla extension. Glumes 2, rounded, short, many veined; lemma broadly rounded, slightly scabrous, 9–11-veined, margins long pubescent, apex mucronate; palea keels scabrous, 2-veined between keels. Anthers yellow, apiculate. Ovary ovoid; style 1, oblong; stigmas 2, plumose. Caryopsis 1–1.2 cm.
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