Rhizome stout, 4-5 mm in diam., with dense, brown, scaly sheaths. Pseudobulbs 2-5 cm apart on rhizome, obliquely attached or almost parallel to rhizome, dark brown and grooved when dried, slightly lucid, suboblong-obovoid or subrhombic, 1.5-5 cm × 8-15 mm, with 2 leaves at apex and 1 or 2 ovate sheaths at base. Leaf blade ovate or ovate-elliptic, (1.5-)3-6 × 1-2.5 cm, leathery, base broadly truncate or subrounded, apex acute or obtuse; petiole 4-9 mm, stout. Inflorescence hysteranthous, usually rather short, 3-6 cm, embraced by sheaths at anthesis except inflorescence; rachis often 2-or 3-flowered, rarely a solitary flower; floral bracts caducous, linear-lanceolate, 2-3 cm; pedicel and ovary ca. 15 mm. Flowers white, with purple veins and 2 brownish yellow eyelike blotches. Sepals lanceolate or oblong-lanceolate, 30-33 × 6-10 mm; lateral sepals slightly shorter and narrower than dorsal sepal. Petals sublinear-oblanceolate or narrowly elliptic-oblanceolate, 30-33 × 3.5-4 mm; lip ovate, 20-25 × 14-16 mm, 3-lobed; lateral lobes erect, nearly suborbicular; mid-lobe ovate, ca. 10 × 6-7 mm, apex acuminate; callus with 2(or 3) irregularly crenulate lamellae extending from base of lip to mid-lobe. Column slightly arcuate, 15-18 mm, both sides winged; wings widened from base to apex, upper part ca. 2 mm wide on one side. Capsule suboblong, ca. 2 × 0.7-0.8 cm, ± 3-ridged. Fl. Jun-Jul, fr. Nov. 2n = 38, 40, 76.
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