Japan Flora: Rhizomes densely tufted; culms erect, 20-40 cm. long; leaf-blades flat, stiffish, 3-5 nun. wide, the sheaths pale, splitting into hairlike brown fibers, these covering the neck of the rhizome; spikes 3-5, contiguous, fastigiate, the terminal staminate, filiform, 1-3 cm. long, the lateral pistillate, erect, short-cylindric, 1-3 cm. long, the lowest one sometimes remote from the others and long-peduncled, the lowest bract bladed, sheathing at base; staminate scales small; pistillate scales elliptic, pale green, entire or mucronate at the apex, the midrib not reaching the margin; perigynia twice as long as the scales, 3 mm. long, erect, rhomboid or ovoid-fusiform, about 3 mm. long, puberulent, obtusely 3- angled, many-nerved, the beak short, somewhat recurved, minutely 2-toothed; stigmas 3, short; Dry fields and rocky slopes in hills and in low mountains.

Honshu (Kanto Distr. and westw.), Shikoku, Kyushu; common. Korea and China. 

var. pocilliformis (Boott) Kuekenth. C. pocillijormis Boott Koppu-moegi-suge. Staminate scales connate ven­trally, infundibuliform; perigynia slightly smaller than in the typical phase.  Honshu, Shikoku, Kyushu. Ryukyus, formosa, and Malaysia.