Rhizome terete, 3-4 mm in diam. Pseudobulbs cylindric, usually ca. 4 cm × 2-4 mm, petiolate base slightly dilated and ± prostrate to rhizome, ± covered with sheaths. Leaf blade 7-15(-21) × (2-)4-7(-9) cm, papery, base subrounded, acute; petiole 1-2 cm. Peduncle 14-18 cm, glabrous, with 2-4 membranous tubular sheaths; rachis 4-7 cm,laxly 4-7-flowered; floral bracts ovate-lanceolate, 1.1-1.6 cm, acuminate. Flowers medium-sized, sepals and petals green, lip white, column yellow; pedicel and ovary 1-1.4 cm. Dorsal sepal oblong-lanceolate, ca. 10 × 2.5 mm, 5-veined, acuminate; lateral sepals ± falcate-oblong, ca. 10 × 3 mm, 5-veined, base adnate to column foot, apex acuminate; mentum spurlike, cylindric, ca. 6 × 2.5 mm. Petals oblong, ca. 10 × 2 mm, acuminate; lip obovate, ca. 9 mm, clawed at base, 3-lobed; lateral lobes broadly sessile, subovate, 1.5-3 × 4-5 mm, obtuse; mid-lobe nearly oblate to subsquare, ca. 9 mm wide, rounded, apical margin slightly denticulate; disk with 2 lunar lamellae running to basal claw. Column 5-7 mm, together with spur 9-16 mm; wings slightly dilated into triangular teeth on both sides near apex. Fl. Jul-Nov.
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