Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1: 955 (1913)
Epiphytic herbs. Roots terete, not or sparsely branching, glabrous, smooth. Stem patent to pendent, rooting at the base or along most of its length. Leaves conduplicate, articulate, distichous, narrowly oblong to linear; margins entire or crenulate near apex; apex asymmetric or bidentate; leaf-sheaths when young with fimbriate, membranous margin. Inflorescence lateral, solitary or fascicled, racemose or more frequently paniculate, with up to three levels of branching, 10–25-flowered. Flowers resupinate, probably ephemeral, many opening at the same time, quaquaversal, whitish or yellowish. Sepals and petals entire, free, narrow, acuminate. Labellum hinged with the apex of the column foot, not spurred, trilobed, midlobe longer than the lateral lobes, with a callus or pair of calli between lateral lobes. Column terete; column foot shorter than column; anther helmet-shaped, with a hood-like extension over the apex of the column; pollinia four, unequal, separate, subglobose, stipe about as long as the pollinia, oblong to linear, viscidium disc-shaped.