Plants turning black when dried, 18-60 cm tall. Tubers ovoid-ellipsoid or oblong, 1.5-3 × 1-1.5 cm, fleshy. Stem erect, terete, stout, with 4-7 leaves. Leaf blade ovate to oblong-lanceolate, 4-10 × 1.5-3 cm, base amplexicaul, apex acuminate or acute. Raceme loosely 3-20-flowered, 5-20 cm; floral bracts ovate-lanceolate, 3-4 × ca. 1 cm, apex acuminate, basal ones ca. as long as ovary; ovary twisted, terete, including pedicel 2-2.5 cm. Sepals green or whitish green, apical margin ciliate; dorsal sepal forming a hood with petals, erect, concave, ovate-elliptic, 18-20 × 9-10 mm, 5-veined, apex obtuse; lateral sepals reflexed, obliquely ovate, 19-21 × 9-10 mm, 5-or 6-veined, apex acute. Petals erect, white, obliquely oblong, falcate, 18-20 × 5-7 mm, 3-veined, unlobed, margin ciliate; lip white, slightly longer than sepal, spurred at base, deeply 3-lobed above base; lobes nearly equal in length, hairy; lateral lobes linear, outer margins with 8-10 filiform lobules; mid-lobe linear, ca. 15 × 1 mm, apex obtuse; spur pendulous, cylindric, 2-3 cm, ca. as long as or shorter than ovary, apex obtuse; connective very broad, 10-12 mm wide; pollinia ovoid; caudicles linear, slender; viscidia orbicular, small, rostellum with elongate arms; stigmas clavate. Fl. Jun-Aug.
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