Plants 18-35 cm tall. Tubers subglobose, oblong, or ellipsoid, 2-3 × 2-2.5 cm, fleshy. Stem erect, terete, papillate-hairy, with 2 nearly opposite leaves at base. Leaf blade spreading horizontally, ovate or orbicular, 3-6.5 × 2.5-7 cm, adaxially with 5-7 white veins, base obtuse-rounded, abruptly narrowed and amplexicaul, apex acute to obtuse. Raceme 4-10 cm, loosely 3-8-flowered; rachis papillate-hairy; floral bracts lanceolate or linear-lanceolate, apex acuminate; ovary twisted, narrowly fusiform, including pedicel 1.5-2 cm, finely papillate-hairy. Flowers yellowish green to whitish. Dorsal sepal forming a hood with petals, erect, ovate, concave, 7-9 × 4.5-5 mm, 3(-5)-veined, apex subobtuse; lateral sepals reflexed, obliquely ovate, 9-11 × 4-5 mm, 3(-5)-veined, apex subacute. Petals shallowly 2-lobed; upper lobe oblique, oblong-lanceolate to ovate-lanceolate, 8-10 × 3-3.5 mm, 2-veined, margin papillate-ciliate, apex subacute; lower lobe a tooth at base of upper lobe, 1.5-2 mm; lip longer than sepals, near base deeply 3-lobed, lobes reflexed; lateral lobes divergent, linear-filiform, 25-40 mm, apically often curled; mid-lobe straight, linear, 10-19 mm, apex obtuse; spur often spreading horizontally, cylindric-clavate, 2-2.5 cm, much longer than ovary, apex obtuse; connective rather wide; stigmas ligulate. Fl. Jul-Aug.
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