Japan Flora: Smooth, terres trial herb; stems 40-80 cm. long, 6- to 8-leaved, covered at base by a few membranous sheaths; leaves broadly lanceolate, 8-15 cm. long, 2-4 cm. wide, gradually acute, prominently nerved, narrowed to the base; spikes 3- to 12-flowered, glabrous, smooth, the bracts membranous, deltoid, about 2 mm. long; flowers yellow, rather large, half-open; sepals ovate-oblong, 14-17 mm. long, obtuse, narrowed to the base, the dorsal sepal narrower, concave on back; lip shortly dilated, 3-lobed, longitudinally 5- to 7-striate on the inside, included within the sepals, recurved at tip; column 8-10 mm. long. Apr.-June. Thickets and thin woods in low mountains;

Honshu (Kanto Distr. and westw.), Shikoku, Kyushu; common. Korea and China.