Japan Flora: Plant usually wholly ferrugineous-puncticulate; culms tufted, 30-60 cm. long, obtusely angled, smooth; leaf-blades flat, 2-3 mm. wide; inflorescence dense, ovoid to ovoid-cylindric, 3-6 cm. long, with 2 or 3 spreading, elongate, foliaceous bracts at base, the spikes numerous, androgynous, ovoid-globose, 4-8 mm. long; pistillate scales membranous, oval, short-awned, fer- rugincous-spotted; perigynia longer than the scales, 4 mm. long, nearly erect, ovate, slightly turgid, planoconvex, mem­branous, many-nerved, with broad serrate wings on upper half, beak long, 2-toothed; stigmas 2.  May-June. Grassy places in lowlands.

Honshu (n. and centr. part, including Kinki Distr.); locally common. Amur, Korea, and China.