Culms ca. 5 m, to 2 cm in diam.; internodes green, striate, 50–60 cm, grooved above branches, glaucous below nodes, initially pubescent, scabrid, apically minutely papillate; cavity with granular pith; nodes prominent; sheath ring corky, densely setose. Culm sheaths green when fresh, purple at apex, basally suboblong, sparsely deciduously yellow-brown setose, more densely so proximally, margins ciliate, apex broad; auricles falcate, fragile, scabrid; oral setae erect or radiate, ca. 2 cm, undulate; ligule arched, short, hirsute, sometimes slightly dentate or ciliate; blade erect or deflexed, green with purple apex, narrowly lanceolate, glabrous, apex acuminate. Leaves 3–5 per ultimate branch; sheath glabrous, margins ciliate; auricles obscure or absent, ciliate; ligule truncate or slightly prominent, coarsely hairy; blade broadly lanceolate, 12–22 × 1.3–2.8 cm, base coarsely hairy, margins serrulate. Pseudospikelets to 13 × 0.3 cm; bracts 2–4, pubescent or sometimes glabrous, apex acute. Rachilla glabrous; lemma mucronate at apex; palea shorter than lemma; lodicules 2 or 3, oblong to rhombic, tomentellate, apex ciliolate. Anthers yellow. Ovary ovoid, glabrous; style 1, about as long as ovary; stigmas (2 or)3-cleft, sparsely pubescent. New shoots Apr–May.
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