Japan flora: Rhizomes short; leaves 2-4, narrowly obovate-oblong, 15-25 cm. long, 各-8 cm. wide, abruptly acuminate, narrowed toward the base, glabrous or scattered puberulent beneath; scapes 30-50 cm. long, with 1 scale about the middle; racemes 15-30 cm. long, loosely 7- to 15-flowered, the bracts membranous, narrowly triangular, 5-8 mm. long, acuminate; sepals spreading, narrowly ovate- oblong, 2-2.5 cm. long, 7-10 mm. wide, acute, 5-nerved, brownish green, tinted purple; petals broadly oblanceolate, 17-22 mm. long, 4-5 mm. wide, acute; lip as long as the sepals, deeply retuse, with cristate ridges on inner side, the lateral lobes small, the terminal lobe rounded, about 15 mm. wide, purplish brown, strongly crisped-undulate, with 3 crested incised ridges within; spur absent. May-June.

Hokkaido, Honshu, Shikoku, Kyushu; rather rare.