Japan Flora: Erect perennial with tuberous roots; stems 40-70 cm. long, few-leaved on lower part; leaves linear, 10-20 cm. long, 3-6 mm. wide, gradually narrowed to the tip, slightly plicate or flat, 1-costate on back, sheathing at base, the upper reduced leaves few, appressed, linear, broadened at base; spikes 7-15 cm. long, manyflowered; bracts 1-1.5 cm. long; flowers white, 1-1.5 cm. across; dorsal sepal erect, ovate, 6-7 mm. long, 5-nerved, the lateral sepals spreading, obliquely ovate, about 7 mm. long; petals erect, subdeltoid, about 6 mm. long, with dilated lower margins; lip about 15 mm. long, about 2 mm. wide, 3-lobed to below the middle, the lobes linear, the lateral lobes horizontally spreading, sometimes declined at tip, usually toothed on one side near the apex; spur 3-4 cm. long, gradually inflated toward apex; ovary 2-2.5 cm. long. Aug. Bogs and wet grassy places;

Hokkaido, Honshu (n. distr.). Korea, Manchuria, Ussuri, and Amur.