Stems suberect or ± scrambling, 20-40(-80) cm, distichously many leaved. Leaf blade narrowly oblong, 7-10 × 0.9-1.1 cm, thickly leathery, unequally obtusely bilobed. Inflorescence solitary, axillary, from upper part of stem, racemose, 12-26 cm, 5-10-flowered; floral bracts ca. 1 mm, membranous. Flowers yellowish, sparsely spotted with purple-red; pedicel and ovary 1.6-2.7 cm. Dorsal sepal narrowly oblong-spatulate, 18-22 × 3-4 mm, obtuse-acute; lateral sepals similar to dorsal sepal, usually somewhat twisted, 26-31 × 4.5-5.5 mm, base with a claw 5-6 mm, margin strongly undulate, recurved. Petals linear, 13-17 × 1.5-2.5 mm, obtuse; lip much smaller, 3-lobed; lateral lobes erect, ovate-lanceolate, 1.5-2 mm; mid-lobe suborbicular, subglobose-saccate in apical half, ca. 2 mm, with 3 ridges near base, with a shortly conic basal sac ca. 2 × 2 mm and a pair of subquadrate lamellate calli between its base and distal edges of lateral lobes, extending downward into sac. Column 3.5-4 mm. Fl. Apr-May.
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