Autotrophic plants. Pseudobulbs cylindrical or clavate, 8-14 cm long, 1.5-2.5 cm in diam., with 2-5 internodes, initially covered with many ovate scales. Leaves 2 or 3, petiolate, oblong, 12-25 cm long, 47 cm wide, acute, mainly 3-nerved; petioles 5-10 cm long. Scapes arising from lower node of pseudobulb, up to 50 cm long, with tubular sheaths below and remotely spaced scales upward; rachis 12-18 cm long; bracts linear, 10-16 mm long, 1.5-2.5 mm wide; pedicel and ovary 15 mm long. Flowers more than 15, pale green or yellowish green with whitish or yellowish lip, perianth spreading, 2-2.5 cm across; dorsal sepal lanceolate, 12-15 mm long, 3-4 mm wide, acute to acuminate; lateral sepals similar to dorsal one but slightly shorter and oblique; petals dotted with red, erect and connivent, obliquely oblong, 11-13 mm long, 3-4 mm wide, acute; lip orbicular in outline when expanded, 13-15 mm across, 3-lobed, lateral lobes with purplish stripes, erect, ovate-falcate, obtuse to rounded at apex; central lobe much broader than long, widely 2-lobulate, lobules with purplish spots, truncate or rounded at apex, spur globose, 3.5-4 mm across, disc with 2 close plate-like calli at entrance of spur; column 4-5 mm long, 3 mm wide; anther conic bell-shaped, 1.5 mm tall, truncate and 2-lobed at apex; pollinia compressed ovoid, with broad triangular viscidium; stigma crescent-like.

PINGTUNG: Nanjenshan, Lin 30; Chialoshui, Su 7554.

Eastern Africa, Sri Lanka, Inida, Indochina, Thailand, Malaysia, Indonesia and Papua New Guinea. Taiwan, only in forests of Hengchun Peninsula.