Japan Flora: Rhizomes slender, rather short; culms 10-20 cm. long, smooth; leaf-blades thick, 0.5-0.7 mm. wide, sulcate above; spike solitary, terminal, uni­sexual or rarely androgynous, 7-14 mm. long, lustrous; pistil­late scales oval, acute, castaneous-cupreous, 3-nerved; perigynia nearly as long as the scales, 3 mm. long, deflexed when ma­ture, ellipsoidal, biconvex, coriaceous, dark yellowkh brown, slightly lustrous, smooth or scabrous on the margins above, several-nerved on both sides, the beak short, emarginate; achenes tightly inclosed, about 2 mm. long; style bifid._June- July. High moors.

Honshu (Rikuchu Prov., Yakeishi-dake) 5 rare. Kuriles, Sakhalin, Kamchatka, Siberia, and Canada.