Japan Flora: Rhizomes densely tufted; culms many, 20-50 cm. long, obtusely angled; leaf-blades stiff, flat or nearly so, 3-6 mm. wide, the sheaths pale, often with brown nerves, fibrous when withered and old; spikes 4-8, the terminal staminate, 1.5-3 cm. long, lanceolate, the others pistillate, often with a few staminate flowers at base, short-cylindric, densely many­flowered, 1.5-3 cm. long, long-peduncled，the lower ones usu­ally binate to ternate at each node, the lower bracts leaflike, loosely long-sheathing; pistillate scales pale, oblong, short- awned; perigynia longer than the 沈ales, 2.5 mm. long, ob­liquely spreading, rhomboid, obtusely 3-angled, faintly nerved, puberulent, rather abruptly short-beaked, with a minutely 2- toothed hyaline apex; stigmas 3, very slender. Mar.-May.

Shikoku, Kynshu. Ryukyus and Formosa.

var. uber (Ohwi) Ohwi. Leaves thin and soft. Shikoku, Kyushu. Ryu­kyus and Formosa.