Annual. Culms erect, 120–150 cm tall, ca. 5 mm in diam., striate. Leaf sheaths loose, glabrous distinctly striate; ligules ca. 1 mm, ciliolate along margin; leaf blades greenish, 20–45 × 0.3–0.5 cm, adaxial surface smooth, abaxial surface scabrous. Panicle contracted 20–40 × ca. 3 cm; branches solitary or in pairs, ascending glabrous in axils. Spikelets yellowish green, glabrous, 2–3 × 0.8–1 mm, 5–9-flowered; rachilla disarticulating between florets from top downward at maturity; pedicels straight or curved, eglandular. Glumes ovate, membranous, subequal, ca. 0.7 mm, 1-veined, apex obtuse. Lemmas apex obtuse or slightly acute, lower lemma ca. 1 mm. Palea along 2 keels glabrous or slightly ciliolate. Stamens 2; anthers 0.3–0.4 mm. Fl. and fr. spring and early summer.

* Forests, moist places. Hainan.