Perennial from short stout rhizome. Culms erect, up to 3 m tall, 4–8 mm in diam., branched, 6–10-noded, nodes densely bearded with upwardly pointing hairs. Leaf sheaths glabrous or setose with tubercle-based hairs; leaf blades cauline, up to 80 × 1–4 cm, abaxial surface glaucous, glabrous or setulose, margins serrate, apex acuminate; ligule 2–5 mm. Racemes 2–4, 4–12 cm. Female zone: sessile spikelet 8–11 mm; lower glume shortly hairy on back, longer hair tufts laterally at base of beak, beak ca. 3 mm, wings ca. 1 mm wide; lodicules absent; pedicelled spikelet 15–20 mm, asymmetrical, broadly winged on one side. Male zone: spikelets oblong-lanceolate, 8–10 mm; lower glume symmetrically winged on margins above middle, wing 0.5–1 mm wide. Fl. and fr. Jul–Sep.
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