Japan Flora: Rhizomes short; culms tufted, 30-70 cm. long, obtusely angled, smooth; leaf-blades rather soft, 2-4 mm. wide; heads 4-10 cm. long, interrupted below, the bracts divergent, elongate; spikes 5-8, gynecandrous, oblong or obovoid, 5-10 mm. long, green; pistillate scales narrowly obcordate, whitish, nearly truncate at apex, the green midrib prolonged into a mucro; perigynia nearly orbicular, 3-3.5 mm. long, much longer than the scales, planoconvex, nerveless, membranous, winged on margins, scabrous above the middle, the beak short, 2-toothed at tip; achenes biconvex with a discoid appendage at apex; stigmas 3, May-June (-July). Waste grounds and roadsides.

Hon­shu, Shikoku, Kyushu; very common. Korea and China.