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Perennial, robust, caespitose from a short woody scaly rhizome. Culms erect, 2–4 m tall, up to 10 mm in diam., often fasciculately branched, many-noded, somewhat glaucous. Leaf sheaths glabrous; leaf blades mostly involute, 20–60 × 0.4–1 cm, glabrous, apex filiform; ligule 1–2 mm. Panicle ample, dense, glistening, 30–80 cm, branches slender, nodding; pedicels 1–4 mm. Spikelets 6–9 mm, florets 5–7, all fertile; glumes light brown, glabrous, subequal, 2–3 mm, acute; lemmas pallid or purplish, 3.5–4.5 mm, lateral veins ciliate with white, soft, ca. 2 mm hairs; awn recurved, 1.5–2.5 mm.
Spikelets 6–9 mm long, oblong, with 5–7 bisexual florets (sterile floret absent); inferior glume 2.2–3 mm long; superior glume 2.6–3.2 mm long; lemmas 3.5–4.5 mm long, lanceolate, the marginal cilia c. 2 mm long, conspicuous, the apical teeth setaceous and up to 1 mm long; awn 1.5–2.5 mm long; anthers c. 1.8 mm long.
A tall reed-like perennial with short scaly rhizome; culms 2–4 m tall and up to 1 cm in diameter, somewhat woody; leaf lamina up to 60 cm × 10 mm, mostly involute, filiform at the apex.
Panicle 30–80 × 8–12 cm, dense, plumose.
