Rhizome 5-7 mm in diam., with dense leathery scaly sheaths; sheaths surrounding young pseudobulb usually with small warts on abaxial surface. Pseudobulbs ovoid to narrowly ovoid, 2.5-6 × 1.5-2 cm, thinly wrinkled when dried, sheathing at base, with 2 leaves at apex. Leaf blade narrowly elliptic or narrowly oblong, 10-16 × 1.3-2.7 cm, leathery, narrowed toward both ends, apex acuminate; petiole 3-7.5 cm. Inflorescence hysteranthous, 12-45 cm, with imbricate, convolute, sheathing sterile bracts at interface between peduncle and rachis; rachis 3-6-flowered, slightly flexuose; floral bracts caducous; pedicel and ovary 1-1.2 cm; rachis continuing to develop and producing a further set of sterile bracts at interface between peduncle and rachis and flowers annually. Flowers dark green-yellow, with brown lip. Sepals narrowly ovate-oblong, 13-15 × ca. 5 mm, 5-7-veined, apex acute. Petals linear or linear-lanceolate, 10-11 × ca. 1 mm, 1-veined, attenuate from base to apex; lip nearly ovate-oblong, 10-13 mm, near middle 3-lobed; lateral lobes subovate; mid-lobe nearly broadly oblong, apex undulate and emarginate; callus with 2 longitudinal lamellae 2-2.5 mm. Column arcuate, ca. 11 mm, upper part with suborbicular wings; wings 4-5 mm, ca. 1.5 mm wide on one side. Fl. Jul. 2n = 40.
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