Plants 32-85 cm tall. Rhizome inconspicuous. Pseudobulbs conic, ca. 15 mm in diam., with 3 or 4 sheaths. Leaves 3, not well developed at anthesis, not deciduous; blade elliptic or elliptic-lanceolate, 20-40 × 5-12 cm, abaxially puberulent, margin undulate, apex acute; petiole-like base 5-20 cm, usually forming a stout pseudostem to ca. 25 cm long and 1-2 cm in diam. Scape arising from leaf axil, 22-80 cm, densely puberulent; rachis to 30 cm, laxly 7-20-flowered; floral bracts persistent, narrowly lanceolate, 7-10 mm, glabrous. Flowers with unpleasant smell, slightly nodding, yellowish brown, large; pedicel and ovary 15-20 mm, puberulent. Sepals similar, oblong-lanceolate, 25-35 × 6-10 mm, abaxially puberulent, 5-7-veined, apex acute or acuminate; lateral sepals slightly narrower than dorsal sepal. Petals subelliptic, ca. 23 × 6 mm, 3-veined, apex acuminate; lip adnate to entire length of column wings, lemon-yellow, 18-24 × 14-15 mm, base shortly clawed, 3-lobed; lateral lobes falcate-oblong, ca. 8 × 4 mm, apex obliquely truncate; mid-lobe narrowly obovate-oblong, ca. 10 × 5 mm, apex acute or rounded and mucronate; disk with 3 undulate lamellae, central one almost reaching apex of mid-lobe; spur yellowish, 2-3 mm, slender, outside puberulent, white pilose around mouth. Column ca. 5 mm, dilated toward apex, sparsely puberulent; rostellum 2-lobed; lobes ca. 1.7 mm; anther cap beaked; pollinia narrowly ovoid, ca. 2 mm; viscidium suborbicular. Fl. Apr-May. 2n = 40*.
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