Culms erect or slightly geniculate at base, 80–100 cm tall, 2–2.5 mm in diam., ca. 4-noded. Leaf sheath margin ciliate; ligule ca. 0.6 mm, papery, apex truncate; leaf blade flat, 8–15 × 0.4–0.6 cm, both surfaces glabrous or adaxial surface scabrous. Spike erect or slightly curved, 16–20 × ca. 0.6 cm; rachis scabrous on back, margin ciliolate. Spikelets 1 per node, narrow, 16–26 mm, with 4–6 florets. Glumes lanceolate, subequal, 8–10 mm, 3-veined, scabrous along veins, apex with mucro 1–2 mm. Lemma narrowly lanceolate, abaxially glabrous; first lemma 10–12 mm; callus glabrous or slightly pilose; awn straight, 20–25 mm, scabrous. Palea subequaling lemma, ciliolate along keels distally, glabrous between keels. Anthers yellow, 2–2.7 mm. Fl. and fr. Jul–Aug.
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