Annual. Culms erect, 0.6–1.5 m tall, sparsely branched, often stilt-rooted. Leaf sheaths with rather rigid tubercle-based hairs; leaf blades linear-lanceolate, 5–25 × 0.5–1.5 cm, tuberculate-hispid on both surfaces; ligule 1–2 mm. Racemes 2–3 cm; peduncle glabrous or sparingly puberulent; rachis internodes ca. 2 mm. Sessile spikelets 2–2.5 mm, brown at maturity; lower glume obovate, ridged or honeycombed, upper part deeply honeycombed with sharp, narrow ribs, smooth and slightly narrowed toward base; upper glume papery. Pedicelled spikelet 3 mm or more, glumes winged. Fl. and fr. Jul–Nov.
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