Japan Flora: Rhi­zomes densely tufted; calms 20-50 cm. long, obtusely 3-angled, glabrous; leaves fascicled, the blades 3-6 mm. wide, flat, stiff, deep green, the basal sheaths splitting into fibers, these thinly covering the neck of the rhizome; spikes 3-5, erect, the termi­nal (rarely the upper 2 or 3) staminate, pale to dark brown, clavate, 1.5-2.5 cm. long, the others pistillate (sometimes the upper ones androgynous), distant, short-cylindric, on long, exserted peduncles, 15-5 cm. long, densely many-flowered, the brae往 short-bladed with inflated sheaths green throughout or dark brown at the base; pistillate scales oblong, abrupdy awned; perigynia slightly longer than the scales, 3 mm. long, obliquely spreading, obovoid, hispidulous, nerved, abruptly short-beaked, entire at tip. Apr.-May. Dry woods and rocky slopes.

Honshu (Izu Isis.); common.