Japan Flora: Stoloniferous, scabrous perennial; culms slender, 30-50 cm. long, erect from a decumbent, branching base; leaf-blades broadly linear, striately nerved, flat, 5-15 cm. long, 5-8 mm. wide, glabrous; ligules 2-2.5 mm. long; panicles narrow, 5-15 cm. long, ex­serted, the branches simple, erect to ascending, with about 10 spikelets, glabrous, slightly flattened, puberulent on axils; spikelets whitish green, sometimes slightly red-tinged, flattened, 4.5-6 mm. long, 1.5-1.7 mm. wide, acute, appressed to the branches, obtuse at base, dimidiate-ovate, brisdy-ciliate; stamens 6, the anthers 2.5-35 mm. long; ovary glabrous. Aug.-Oct. Ponds and paddy-fields.

Honshu, Shikoku, Kyushu. China, Korea, and Ryukyus.