Plants 13-24 cm tall. Tubers ovoid or oblong, 1.5-3 × 1-1.5 cm, fleshy. Stem erect or ascending, terete, slender, 1-2 mm in diam., finely papillate-pubescent, with 2 nearly opposite leaves at base, and 1-3 bractlike leaflets above leaves. Leaf blade spreading horizontally, adaxially with yellowish white markings, ovate-orbicular or orbicular, 4-4.5 × 4-5 cm, slightly fleshy, base abruptly narrowed and amplexicaul, apex acute. Raceme 4-9-flowered, 5-15 cm; rachis finely papillate-pubescent; floral bracts lanceolate, much shorter than ovary, apex acuminate; ovary twisted, cylindric, including pedicel 7-8 mm, papillate-pubescent. Flowers yellowish green. Dorsal sepal ovate, concave, 3-3.5 × ca. 2.5 mm, 3-veined, ciliate, apex acute; lateral sepals strongly reflexed, obliquely ovate, 5-5.5 × ca. 4 mm, 4-veined, ciliate, apex acute. Petals connivent with dorsal sepal, deeply 2-lobed; upper lobe falcate-oblong, ca. 4 mm; lower lobe linear, ca. 8 mm; lip spurred at base, deeply 3-lobed above base; lateral lobes divaricate, filiform, ca. 1.5 cm, apex curled; mid-lobe linear, much shorter than lateral lobes; spur pendulous, cylindric, clavate below middle, longer than ovary; connective broad; pollinia obcuneate; caudicles curved, linear, slender; viscidia subglobose; rostellum with slender lateral lobes. Fl. Aug.
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