Plants 9-25 cm tall. Tubers oblong, 1.5-2 cm × 8-10 mm, fleshy. Stem erect, glabrous, below middle with 2 or 3 leaves, with 1-4 bractlike leaves above. Leaf blade cordate or ovate, 2.5-5 × 1.8-3.5 cm, with white margin when dried, apex acute. Raceme 2-8-flowered, 3-5 cm; floral bracts lanceolate, ca. 2 cm, nearly as long as ovary, apex acuminate; ovary twisted, terete, including pedicel 1.8-2 cm. Flowers white, sometimes secund. Sepal and petal margins ciliate; dorsal sepal forming a hood with petals, erect, ovate or elliptic, concave, ca. 8 × 5 mm, 5-veined, apex acute; lateral sepals reflexed, obliquely ovate, 9-10 × ca. 5 mm, 5-veined, apex acute. Petals linear, subfalcate, ca. 6 × 2 mm, 1-veined, unlobed, apex obtuse; lip broadly obovate, ca. 12 × 10 mm, 3-lobed; lateral lobes rhombic, ca. 4 mm wide, margins serrate; mid-lobe ligulate, ca. 4 × 2 mm, slightly longer than lateral lobes, apex subobtuse; spur pendulous, cylindric, 17-20 mm, slightly shorter than or nearly as long as ovary, apex slightly dilated, obtuse, slightly curved; stigmas oblong. Fl. Aug-Oct. 2n = 64*.
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