Erect, epiphytic herbs. Stem leafy. Leaves distichously arranged, linear to narrowly elliptic or obovate, with a sheathing leaf base. Inflorescence axillary, simple, racemose, one- to few-flowered; peduncle and rachis glabrous; bracts triangular. Flowers white, sometimes with yellow in throat of labellum. Sepals erect, elliptic, obtuse, lateral sepals spreading. Petals spreading, elliptic, similar to sepals. Labellum concave, simple or obscurely trilobed, obovate or cordate, ecallose, with an elongate, incurved, cylindrical, nectariferous spur at base. Column lacking a foot; pollinia two, porate, stipe oblong-linear, viscidium suborbicular; stigma concave. Ovary and pedicel glabrous.