Plants 17-40 cm tall. Tubers oblong, 2-5 × 1-2 cm, fleshy. Stem erect, terete, stout, glabrous, with 4 or 5 leaves and 5-9 bractlike leaflets. Leaf blade narrowly elliptic or oblong to oblong-lanceolate, 5-10 × 1-2 cm, base amplexicaul, apex acuminate. Raceme densely many flowered, 3.5-6 cm; floral bracts lanceolate, 2-2.5 cm, ciliate, apex acuminate; ovary twisted, cylindric-fusiform, including pedicel 1.8-1.9 cm. Flowers white, lateral sepals with brown markings. Dorsal sepal forming a hood with petals, erect, broadly elliptic, concave, ca. 6 × 4 mm, 3-veined, apex obtuse; lateral sepals reflexed, obliquely elliptic, ca. 9 × 4.5 mm, 4-veined. Petals oblique, narrowly ovate or narrowly elliptic, ca. 6 × 3 mm, 3-veined, unlobed, apical margin ciliate; lip spurred at base, with a 3-toothed, subcylindric lamella near mouth of spur, deeply 3-lobed from base, lobes linear; lateral lobes divaricate, 6-8 × ca. 1 mm, attenuate toward apex; mid-lobe ca. 10 × 2 mm, apex obtuse; spur pendulous, cylindric-clavate, 2-2.2 cm, slightly longer than ovary, apical half slightly dilated, apex obtuse; connective relatively narrow; pollinia narrowly ellipsoid; caudicles linear, longer than pollinia; viscidium elliptic, small; stigmas oblong, ca. 2.5 mm. Fl. Jul-Aug.
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