Japan Flora: Rhizomes elongate, slender, 3-4 mm. in diameter; stems erect, 15-30 cm. long, angled; leaves oblong-lanceolate, 4-7 cm. long, 1.5-3 cm. wide, sessile, the nerves loosely papillose beneath; flowers 1 to 2, yellowish green, 15-18 mm. long, the pedicels 7-J5 mm. long, the filaments slightly papillose, the anthers deltoid-lanceolate, 3-3.5 mm. long, slightly shorter than the filaments. June-July. Meadows and thin woods in lowlands from sea level to the foot of the mountains;

Hokkaido, Honshu (centr. and n. distr.), Kyushu. Sakhalin, Kuriles, Korea, Manchuria to Siberia.