A terrestrial herb 15-60 cm tall, with a short stout creeping rhizome and fibrous roots, often forming clumps. Erect stems glandular-pubescent, terete, leafy above. Leaves three to four, suberect-spreading, strongly pleated, often with upcurved sides, elliptic to ovate, rarely lanceolate, acute to acuminate, 6-18 cm long, 3-9 cm wide, green. Inflorescence one- or less commonly two-flowered; bracts leaf-like, lanceolate to ovate or elliptic-ovate, acuminate, 1-6 cm long. Flowers showy, the sepals and petals maroon or rarely green, the lip yellow spotted within with red, the staminode yellow spotted with red; pedicel and ovary c. 3 cm long, shortly glandular- pubescent. Dorsal sepal suberect, elliptic-lanceolate or ovate, acuminate, 3.5-5 cm long, 1.5-2 cm wide, rarely slightly twisted towards apex, ciliate. Synsepal elliptic-lanceolate or lanceolate, acuminate and bidenticulate at apex, 3.5-5 cm long, 1.5-1.8 cm wide, the sides recurved somewhat, ciliate. Petals deflexed at c. 45° to horizontal, spirally twisted one to three times, linear-tapering, acute or acuminate, 3.5-6~5cm long, 0.5-0.7 cm wide, pubescent at base within. Lip glossy, ellipsoidal to obovoid, 3-5.3 cm long, 2.5-3 cm wide, the margins smoothly incurved with a fold at the base on each side. Column c. 1 cm long; staminode shortly stalked, longitudinally channelled, slightly concave at apex, obovate with a cordate base, blunt, 1-1.2cm long, 0.7-0.9 cm wide; filament extending beyond anthers, acute.
DISTRlBUTION. Europe (from northern England and Scandinavia, eastern France, NE. Spain, Germany, N. Italy and N. Greece (now extinct) and eastern Europe eastward to European Russia, Siberia, N. Sakhalin, Korea, NE. China (Heilongjiang, Jilin, Nei MonggoI), andJapan (Rebun Isl., fide S. Kawahara pers. comun.).