Plants 20-30 cm tall. Tubers subglobose or ellipsoid, 1-2 × 1-1.5 cm. Stem erect or ascending, terete, 3-5 mm in diam., finely papillate-hairy, with 2 nearly opposite leaves at base. Leaf blade spreading horizontally, broadly ovate or orbicular, 3-4.5 × 3-5 cm, slightly fleshy, with 5(-7) green veins, base obtuse-rounded, abruptly narrowed and amplexicaul, apex shortly acuminate or acute. Raceme erect, with 3-7 often secund flowers, 4-12 cm; rachis finely papillate-hairy; floral bracts linear or lanceolate, apex acuminate; ovary twisted, arching, fusiform, including pedicel 1-1.5 cm, papillate-hairy. Flowers yellowish green. Dorsal sepal forming a hood with petals, erect, ovate, concave, 7-8 × ca. 3.5 mm, 3-veined, apex obtuse; lateral sepals reflexed, obliquely ovate, 8-9 × 3.5-4 mm, 3-veined, apex subobtuse. Petals shallowly 2-lobed; upper lobe obliquely oblong-lanceolate, 8-9 × 2-2.5 mm, 2-veined, margin papillate-ciliate, apex obtuse; lower lobe a tooth at base of upper lobe, 1.5-2 mm; lip reflexed, longer than sepals, spurred at base, adaxially with an appendage 5-7 mm, above base deeply 3-lobed; lateral lobes linear-filiform, 2.5-2.8(-4) cm, apex often curled; mid-lobe linear, 1.3-1.9 cm; spur cylindric-clavate, 2-2.5 cm, longer than ovary, apex obtuse; connective rather wide; stigmas narrowly clavate. Fl. Jul-Aug.
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