Plants turning black when dried, 65-75 cm tall. Tubers oblong, 2-5 × 0.8-1.5 cm, fleshy. Stem erect, terete, stout, 4-6 mm in diam., with 5-7 leaves. Leaf blade ovate, ovate-oblong, or oblong-lanceolate, 5-12 × 1.5-4.5 cm, base amplexicaul, apex acuminate. Raceme 4-15-flowered, 4-21 cm; floral bracts lanceolate, ca. 4.5 cm, apex acuminate, basal ones longer than ovary; ovary twisted, terete, including pedicel 2.5-3.5 cm. Sepals greenish or white, margin ciliate; dorsal sepal erect, oblong, concave, 15-18 × 6-7 mm, 5-veined, apex obtuse; lateral sepals reflexed, obliquely ovate-lanceolate, 17-20 × 6-8 mm, 5-7-veined, apex acuminate. Petals forming a hood with dorsal sepal, erect, white, obliquely lanceolate, subfalcate, 14-17 × 3-4 mm, 3-5-veined, margin ciliate, unlobed, apex subacute; lip white or yellowish, 2.5-3 cm, spurred at base, deeply 3-lobed above base; lobes linear, margin ciliate; lateral lobes 2-2.5 cm, outer margin with 7-10 filiform lobules, lobules usually branching; mid-lobe nearly as long as lateral lobe, apex acute; spur pendulous, curved inward, cylindric, 4.5-6.5 cm, longer than ovary, slightly dilated toward apex; connective ca. 4 mm wide; pollinia narrowly ellipsoid, ca. 4 mm; caudicles linear, ca. 5 mm; viscidia suborbicular, small; stigmas clavate, ca. 5 mm. Fl. Jun-Aug.
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