Description from Flora of China
Annual. Culms decumbent, rooting at lower nodes, up to 50–100 cm, nodes glabrous or pubescent. Leaf sheaths glabrous or pubescent; leaf blades narrowly lanceolate, 5–20 × 0.3–1 cm, thinly pilose to tomentose, apex acuminate; ligule ca. 2 mm. Racemes 3–10, spreading, 4–10 cm; rachis internodes filiform, glabrous or lower edges sparsely ciliate, equaling or slightly longer than spikelet. Spikelets 4–5.5 mm; callus shortly bearded; lower glume lanceolate, back shallowly concave, obscurely 2-veined between keels, glabrous, keels stoutly pectinate-ciliate, apex shortly 2-toothed; upper glume hispid on keel, apex attenuate into 1(–3) mm awnlet; lower floret absent; upper lemma ca. 1 mm, hyaline, minutely 2-toothed; awn fine, flexuous, 2–2.5 cm, apex hairlike; upper palea ca. 1.5 mm, irregularly toothed. Anthers 3, 1.5–1.8 mm. Fl. and fr. Aug–Oct.
Montane forests and forest margins, moist places on pathsides, clearings, streams, forming colonies; middle elevations. Fujian, Guangdong, Taiwan [Indonesia, Malaysia].