Rhizome neck 3–6 cm. Culms 3–7 m, 1–3 cm in diam.; internodes terete, 18–25 cm, initially sparsely white-gray setose, longitudinal ribs prominent; wall 3–5 mm thick, pith spongy; supra-nodal ridges weakly prominent; sheath scar prominent, initially densely yellow-brown setose. Branches 6–9 per node. Culm sheaths persistent, triangularly narrowly rounded, shorter than internodes, leathery, proximally brown setose and woolly, margins glabrous, apex triangular; auricles and oral setae absent; ligule truncate, ca. 0.7 mm; blade deciduous, reflexed, linear-lanceolate. Leaves 4–8(–15) per ultimate branch; sheath becoming red-brown, glabrous; auricles absent; oral setae 3–10 mm; ligule arcuate, ca. 1 mm, glabrous; blade narrowly lanceolate, 6–14 × 0.7–1.2 cm, glabrous or abaxially sparsely pilose proximally, secondary veins 3-or 4-paired, transverse veins obscure, base cuneate, one margin spinescent-serrulate, other margin obscurely so. Inflorescence a raceme, exserted from spathe; spikelets 5–11, 2.5–4.2 cm, rachilla internodes 2.5–6 mm, white-gray setulose; florets 4 or 5, green. Glumes 2, glabrous, apex acuminate; lemma glabrous, apex acuminate; palea keels ciliate; lodicules apically ciliate. Anthers yellow. Ovary ovoid, light yellow, glabrous; style 1; stigmas 2. Caryopsis dark brown, oblong. New shoots Sep.
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