Japan Flora: Plants 20 cm high; pseudobulbs ovoid-globose, 6-12 mm. long; leaves 2, narrowly ovate or ovate-oblong, 6-10 cm. long, 2-3.5 cm. wide, acute, cuneate or acute at base, the petioles 4-8 cm. long, sheathing at base; peduncles 20-40 cm. long, erect; racemes 10-20 cm. long, loosely many-flowered; bracts spreading, deltoid-ovate, 1-1.5 mm. long, acute; flowers pale green or purplish; sepals linear-lanceolate, 8-9 mm. long, subobtuse; petals as long as the sepals, filiform; lip obovate, flat, 7-8 mm. long, 4.5-55 mm. wide, pointed, erect, slightly recurved at tip; column about 2.5 mm. long, narrowly deltoid-winged. June-Aug. Woods;

Hokkaido, Honshu, Shikoku, Kyushu. Korea, Manchuria, and Amur.