Plants 40-100 cm tall. Pseudobulb ovoid-conic, 5-10 × 1.5-4 cm. Leaves 4-8, on upper part of pseudobulb; blade normally green with yellow or white spots, ovate-elliptic or elliptic-lanceolate, 25-60 × 5-20 cm, glabrous, apex acuminate or acute. Inflorescences arising from basal or lower nodes of pseudobulb, normally not exceeding height of leaves, 50-90 cm, 8-25-flowered, glabrous; floral bracts persistent, ovate-lanceolate, 2.5-4 × 0.5-0.7 cm, glabrous. Flowers not widely opening, 4-7 cm in diam.; pedicel and ovary 2-3 cm, glabrous; sepals and petals pale yellow to mid-yellow, sepals often green tipped, often turning indigo-blue when dried. Sepals subsimilar, oblong-obovate, 2.5-4 × 0.7-1.5 cm, glabrous, apex obtuse to subacute. Petals oblong-elliptic, 2.5-4 × 0.7-1.5 cm, apex obtuse-subacute; lip yellow with orange or brown marks, apical margin brown, obovate, 2.5-4.5 × 2.2-4.5 cm, shallowly 3-lobed; lateral lobes subobovate, margin undulate, apex rounded-truncate; mid-lobe orbicular, undulate-crisped, apex emarginate; disk with 3 or 4 brown ridges, glabrous; spur slightly curved, white, conic, 0.5-0.8 × ca. 0.2 cm, apex obtuse. Column white, 1.5-2 cm, densely white pubescent ventrally; rostellum suborbicular; anther cap white. Fl. Apr-Oct. 2n = 38, 42.
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