Japan Flora: leaf-blades thinner, vivid- to deep-green, flat, 4-7 mm. wide, nearly smooth; panicle branches geminate, smooth or slightly scabrous; glumes lanceolate, rather acute, the lower 2-2.5 mm., the upper 2.5-3 mm. long; lemmas narrowly oblong, 3.5-4 mm. long; anthers narrowly oblong. July-Aug. Wet places in cool, coniferous woods.
Hokkaido, Honshu (centr. distr. and northw.); rather common. Sakhalin, Kuriles, and Kamchatka.