Plants 20-32 cm tall. Tubers ellipsoid, ca. 2 cm. Stem with 1 tubular cataphyll at base, 1-or rarely 2-leaved. Leaf abaxially pale green, adaxially green with purple spots, ovate, 4-11 × 3-8 cm, base cordate or rounded, apex acute or cuspidate. Inflorescence 17-30 cm, with 2-4 sterile bracts; rachis 6-11 cm, laxly to subdensely 3-9-flowered; floral bracts lanceolate, to ca. 12 mm, apex acuminate or long acuminate. Flowers purplish red; pedicel and ovary erect, slightly arcuate, 16-24 mm. Dorsal sepal ovate-elliptic, 6-7 × ca. 3 mm, 3-veined, apex obtuse; lateral sepals broadly ovate, oblique, ca. 8.5 × 5 mm, adaxially finely papillate, 3-or 5-veined, apex obtuse. Petals obliquely rhombic-ovate, ca. 6 × 3.5-4 mm, adaxially inconspicuously papillate, 3-veined, apex obtuse; lip broadly obovate-cuneate, 3-lobed, ca. 12 × 10 mm, adaxially finely papillate; lateral lobes broadly triangular to suboblong, margin sometimes irregularly serrulate, apex obtuse to acute; mid-lobe subsquare to rectangular, margin often tapering slightly toward apex, truncate, apex divided into 2 rounded lobules; spur straight and horizontal or slightly curved downward, narrowly conic, gradually attenuate, 14-18 mm, slightly shorter than ovary, apex sometimes hooked. Column ca. 3 mm; rostellum ovate, ca. 2 mm, apex acute. Fl. Jul-Aug.
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