Description from Flora of China
Herbs, epiphytic, monopodial, medium-sized. Stem pendulous, long, sometimes branching, leafy. Leaves oblong to elliptic, unequally bilobed. Inflorescence axillary, pendulous, racemose or paniculate, densely many flowered. Flowers small. Sepals and petals similar, spreading; mid-lobe spreading; lip immovable, rather fleshy, 3-lobed; lateral lobes erect, small, sometimes fleshy; spur apical, inflated, with callosities on scales within. Column short, stout, lacking a foot; rostellum large or small; stipe spatulate, often hooklike, long; viscidium small; pollinia 2, grooved.
About 40 species: from the Himalayas to Australia and the SW Pacific islands, with a few species extending to Indochina and China; two species in China.
(Authors: Chen Xinqi (陈心启 Chen Sing-chi); Jeffrey J. Wood)