Japan Flora: Culms slender, tufted, sulcate, 6- 40 cm. long; sheaths light green, the mouth transversely truncate and short-mucronate; spikelets ovoid, densely many­flowered, obtuse, 4-8 mm. long, 3-4 mm. thick, ferrugineous; scales ovate, 2-2.5 mm. long, obtuse; achenes obovoid, pale, tawny, 1 mm. long, lustrous, smooth, turgid-lenticular, the style base compressed, deltoid, 1 /2-2/3 as wide as the body of the achene, the bristles 6, twice as long as the achene, retrorsely scabrous, light ferrugineous. July-Oct. Wet places.

Hokkaido, Honshu (n. and centr. distr.); rather rare. Manchuria, Ussuri, Dahuria, India, and Europe