Description from Flora of China
Herbs, epiphytic. Rhizome creeping, stout, rooting from nodes of rhizomes. Pseudobulbs often spaced on rhizome, with a leaf at apex. Leaf long petiolate; blade thickly textured, base contracted into petiole. Scape arising laterally from base of pseudobulb; raceme sparsely many flowered; floral bracts persistent, shorter than pedicel and ovary. Flowers medium-sized. Dorsal sepal usually smaller than lateral sepals; lateral sepals adnate at base to distal half of column foot, their lower edges connate at base or apex to each other. Petals smaller than sepals, base decurrent and adnate to basal half of column foot, margins denticulate or erose; lip 3-lobed, usually pandurate, base attached to end of column foot by a mobile joint, with 2 small auricles on both basal sides; disk with 2 lamellae adaxially. Column stout, both sides winged, with distinct stelidia; foot rather long, upcurved; pollinia waxy, 4, unequal in size, in 2 pairs, subglobose, with a common stipe and a viscidium.
About three species: Nepal to Myanmar, Thailand, and Vietnam; one species in China.
(Authors: Chen Xinqi (陈心启 Chen Sing-chi); Jaap J. Vermeulen)