Perennial from a knotty base. Culms solitary or loosely tufted, erect, smooth, 40–100 cm tall, 4–7-noded. Leaf sheaths smooth or ciliate along one margin; leaf blades broadly lanceolate, 5–15 × 1–2.5 cm, abaxial surface glabrous with cross veins, adaxial surface glabrous or loosely hispidulous, apex long-attenuate; ligule 1–1.5 mm. Panicle open, 12–25 cm, primary branches up to 15 cm, the spikelets clustered around them; pedicels 2.5–3 mm, slender, pubescent. Spikelets ca. 5 mm, florets 2–3; glumes 3–5-veined; lower glume 2–2.5 mm, acute; upper glume 3–3.5 mm, mucronate; lowest lemma ca. 4 mm, 7-veined, glabrous, apex apiculate; second and third lemmas 3–3.5 mm, coarsely setose with tubercle-based, reflexing bristles near upper margins; paleas firm, ciliolate along keels. Caryopsis ellipsoid, 1–1.2 mm. Fl. and fr. Jun–Oct. 2n = 24.