Japan Flora: Slender, erect perennial with nearly spherical, tuberous roots; stems 20-40 cm. long, with 3-5 leaves on lower part and few scalelike leaves above; leaves ascending, broadly linear to narrowly lanceolate, 5-10 cm. long, 3-6 mm. wide, acuminate, sheatiling at base, the upper scalelike leaves appressed to the stem, dktant, linear, gradually acuminate; bracts green, 7-12 mm. long; flowers 1-3, rarely 4, about 3 cm. across, white; sepals 5- to 7-nerved, narrowly ovate, obtuse, green, 8-10 mm. long, the lateral ones spreading, oblique; petals white, obliquely ovate, few-nerved, erect, forming a hood with the dorsal sepal, 10-12 mm. long, subacute, toothed or shallowly laciniate on the outer margin; lip white, short- cuneate, 3-lobed, about 15 mm. long, the lateral lobes obliquely flabellate, deeply laciniate on outer margin, the terminal lobe linear, rather obtuse, entire, about 1 cm. long, 2 mm. wide, 3-nerved; spur 3-4 cm. long, narrowly cylindric, gradually thickened toward the apex; ovary about 1.5 cm. long. Aug. Wet grassy places in lowlands;

Honshu, Shikoku, Kyushu.