Plants 55-100 cm tall. Pseudobulb stemlike, cylindric, 40-50 × 0.6-1 cm. Leaves 6 or 7; blade elliptic, 10-34 × 5-12 cm, glabrous, apex acute. Inflorescences arising from lower or basal nodes of pseudobulb, not exceeding height of leaves, to 45 cm, sparsely 5-or 6-flowered, glabrous; floral bracts caducous, ca. 3 cm. Flowers widely opening, 6-8 cm in diam.; pedicel and ovary 2.5-3 cm, glabrous; sepals and petals yellow outside, purplish red or pink inside. Sepals subsimilar, elliptic, 3.8-4.2 × 1.4-1.6 cm, glabrous, apex obtuse. Petals oblanceolate, 3.7-3.9 × 1-1.2 cm, apex obtuse; lip lateral lobes densely purplish red spotted, obovate-triangular, ca. 3.5 × 3.2-3.7 cm, 3-lobed; lateral lobes subobovate, margin undulate, apex obtuse; mid-lobe broadly obovate, margin crisped, apex emarginate; disk with 2 or 3 yellow ridges, glabrous; spur yellow, horn-shaped, 2-2.3 × ca. 0.4 cm, apex forming a hook. Column yellow, with purplish red spots, ca. 2.7 cm, glabrous; anther cap pale yellow. Fl. Sep.
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