Japan Flora: Plant densely tufted forming large clumps; culms many, 30-40 cm. long, glabrous; leaves evergreen, with flat, thick, deep green, lustrous, smooth blades, 8-12 mm. wide, the basal sheaths pale green with brown nerves; spikes 4 or 5, distant, light green, the upper somewhat approximate, the terminal staminate, broadly linear, 3-5 cm. long, the lateral pistillate, cylindric, 25-35 mm. long, densely many-flowered, erect on exserted peduncles, the bracts short, with a long sheath; pistillate scales ovate, pale green; perigynia much longer than the scales, 4-  5 mm. long, nearly erect, obovate, pale green, glabrous, bi­convex, several-ribbed, short-beaked, with a membranous emarginate tip; beak of achenes with annulate base; stigmas 2.  Mar.-May. Evergreen woods near seacoasts.

Honshu (Etchu, Shima Prov., and westw.), Shikoku, Kyushu. s. Korea.