Culms 1–3 m, 0.5–0.8 cm in diam.; internodes striate, to 26 cm, glabrous, lumen 1–2 mm in diam.; supra-nodal ridge rather elevated; sheath scar flat; intranode 4–5 mm. Culm sheaths closely encircling culm, shorter than internode, leathery to papery, pale brown strigose, densely retrorsely so at base, tubercles of fallen hairs persistent, margins densely ciliate; auricles and oral setae absent; ligule truncate, 0.5–1 mm, puberulent; blade deciduous, narrow, glabrous. Leaves 1–4 per ultimate branch; sheath glabrous except for ciliate distal margins, dorsally keeled; auricles and oral setae absent; ligule truncate, ca. 0.5 mm, puberulent; pseudopetiole short; blade broadly lanceolate, 14–25 × 2.5–4 cm, papery, glabrous, secondary veins 5–9-paired, tessellations rectangular, base broadly cuneate, apex caudate-acuminate. Panicles large, 15–26 cm; branches 3 per node, pulvinate. Spikelets yellow-green, ca. 1 cm; pedicels stiff, 1–5 mm, puberulent; florets ca. 5. Rachilla compressed, puberulent; internodes ca. 2 mm, readily disarticulating. Glumes glabrous except for midrib distally; lower glume purple-green, lanceolate, 3.5–4 mm, 3-veined, apex acuminate; upper glume yellow-green, 5.5–6 mm, inconspicuously 3-veined with prominent midrib, distally scabrous with minute hairs; lemma yellow-green, narrowly lanceolate, 5–6 × ca. 2 mm, papery, glabrous except for one ciliolate margin, 7-veined, callus with hairs 0.5–1 mm; palea 4.5–5.5 mm, apically puberulent between keels, otherwise glabrous, margins membranous; lodicules membranous, ca. 1 × 0.3–0.4 mm, posterior oblong, margin sparsely ciliolate, apex obtuse; anterior pair oblong-ovate, not ciliate, apex acute. Anthers yellow, ca. 4 mm. New shoots Apr, fl. May.
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