Plants 20-50(-75) cm tall. Tubers 3-5 × 1-2 cm, fleshy. Stem erect, terete, glabrous, with 3 or 4 leaves and 3-9 bractlike leaflets. Leaf blade narrowly oblong to narrowly oblong-lanceolate, 5-12(-27) × 1.2-2 cm, base amplexicaul, apex acuminate. Raceme densely 9-20-flowered, 2.5-6 cm; floral bracts linear-lanceolate, 1.2-2.5 cm, ciliate; ovary twisted, cylindric-fusiform, including pedicel 1.8-2.3 cm. Flowers yellow or brownish yellow. Dorsal sepal forming a hood with petals, erect, broadly elliptic, concave, 4-5 × 3-3.5 mm, 3-veined, apex obtuse; lateral sepals reflexed, oblique, broadly obovate, 6-7 × 4-4.5 mm, 3-or 4-veined, apex obtuse or subacute. Petals oblique, narrowly ovate or obliquely narrowly elliptic, 4-5 × 2-2.5 mm, 1-veined, apex obtuse; lip 9-10 mm, spurred at base, with a ring-shaped rim at mouth of spur, 3-lobed from base; lateral lobes subulate, 1.5-2.75 mm, apex acuminate; mid-lobe linear, 8-9 mm, apex obtuse; spur pendulous, cylindric, 2-2.9 cm, longer than ovary, slender, slightly thickened toward end, 1-1.5 mm in diam., apex obtuse; connective narrow; pollinia narrowly obovoid; caudicles linear, longer than pollinia; viscidia ovate; stigmas oblong, ca. 1.5 mm. Fl. Jun-Aug.
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