Japan Flora: Stems 5-28 cm. long, tufted, simple or slighdy branched at base, green, decumbent or ascending, slender, firm, wiry, 0.5-1 mm. thick, solid, slightly flexuous, 6-ribbed, tuberculate on the ribs; sheaths short, rather loose, 양^이! at base, black upwardly, the teeth pale brown, ovate, broadly scarious on margin, with an awnlike excurrent midrib; spikes 2-3 mm. long, sessile or short-pedunculate. Along valleys in mountains;

Hokkaido; rare. Sakhalin, Siberia to Europe, and N. America.