Japan Flora: Rhizomes extremely slender, terminated by a small tuber; culms soft, slender, 3-5 cm. long, light green, the sheaths thin- membranous, soon withering, inconspicuous; spikelets ovoid to oblong, 3 mm. long, compressed, light green, few-flowered; scales ovate, hyaline, lustrous, 15 mm. long; achenes obovoid, about 1 mm. long, stramineous, smooth, with an indistinct apical annular disc, the brisdes 4, slender, slightly longer or shorter than the achene, minutely retrorsely scabrous. 

Shi­koku and Kyushu. Europe, Siberia, and N. Africa.