Japan Flora: An­nual or biennial with fibrous roots; culms loosely tufted, soft, smooth, 15-30 cm. long; leaf-blades 1.5-2.5 mm. wide, gla­brous, spikes numerous，densely crowded in a terminal hemi­spherical head 15-20 mm. long and as wide, the bracts 2-3, leafy, much longer than the inflorescence; pistillate scales lan­ceolate, awn-tipped, membranous, pale; perigynia much longer than the scales, 7-10 mm. long, erect, narrowly lanceolate, scabrous and narrowly winged on the margins, planoconvex, pale green, membranous, Iong-stipitate, with a flat, long, deeply bifid beak; achenes small; stigmas 2.  Wet sandy soil.

Hok­kaido, Honshu (Lake Kawaguchi in Kai); rare,  Siberia and Europe