Perennial. Culms soft, decumbent at base, rooting at lower nodes, 30–60 cm tall, 1.5–2 mm in diam. Leaf sheaths smooth, longer or lower shorter than internodes; leaf blades flat or folded, flaccid, 5–12 cm × 2–3 mm, smooth or adaxial surface scabrid, apex acute; ligule 5–6 mm. Panicle narrow, 15–19 cm, base included in uppermost leaf sheath or shortly exserted; branches 2 at lower nodes, suberect, bearing 1–3 spikelets, panicle racemelike toward apex. Spikelets linear-oblong, 1–1.6 cm, florets 5–9, green; glumes oblong-ovate, membranous, 1-veined, lower glume 1.7–2 mm, apex acute, upper glume 2.7–3 mm, apex obtuse; lemmas lanceolate-oblong, 4–4.5 mm, herbaceous, smooth or scaberulous, 7-veined, veins scaberulous, apex membranous, obtuse; palea as long as or slightly longer than lemma, keels narrowly winged, apex emarginate. Stamens 3, anthers 0.7–1 mm.

* Damp places. SW Guizhou (Xingyi), E Yunnan.