Japan Flora: Roots horizontally spreading, thickened; stems stout, 50-80 cm. long; leaves 12-16, alternate, the upper ones gradually reduced, the lower 4-6 larger, linear-lanceolate to broadly linear, 10-20 cm. long, 1-2 cm. wide, acute to acuminate; racemes 10-20 cm. long, densely many-flowered; bracts linear-lanceolate, long- acuminate; flowers white, fragrant; dorsal sepal elliptic, flat, 5- to 7-nerved, very obtuse, 4一5 mm. long, the lateral sepals pendulous, falcate, narrowly oblong, 6-7 mm. long, obtuse; petals narrowly ovate, obtuse, thickened, about 7-nerved, slightly shorter than the dorsal sepal; lip ligulate, narrowly oblong, carnose, rounded at apex; spur longer than the sepals，1-1.2 cm. long, linear, slender. June-July. Wet places and bogs;

Hokkaido, Honshu, Shikoku; locally abundant. s. Kuriles, Korea, Manchuria, and e. Siberia.