Japan Flora: culms 30-50 cm. long, rather firm, slender, dis­tinctly several ribbed, 1-2 mm. thick, the sheaths 5-10 cm. long, hyaline, frequently somewhat reddish; spikelets narrow- ovate to lanceolate, 7-15 cm. long, 3-3.5 mm. thick; lower 2 scales empty and clasping, the others fertile, oblong, erect, 3-4 mm. long, reddish brown, obtuse; achenes 1-1.3 mm. long, turgid-biconvex, yellowish, the style-base depressed, spongy, 1/3 as broad as the achene, the bristles 4 in forma setosa Kitag., slender, ferrugineous, retrorsely scabrous, often flexu­ous, longer than the style base, sometimes none in forma val- leculosa. July-Oct. Wet sandy places.

Honshu (Kai, Ugo), Kyushu; rare. Korea, Manchuria, and China