Epiphytic or terrestrial herbs. Roots basal. Pseudobulb fusiform or ovoid, homoblastic, three- to five-leaved. Leaves lanceolate, ovate or elliptic, acute to acuminate, pleated, articulate or not to a sheathing base. Inflorescence basal, racemose, simple; bracts deciduous. Flowers cupped, white, pink or rose-purple, marked with yellow on the callus. Dorsal sepal free, elliptic to obovate-elliptic, erect to porrect; lateral sepals oblique at base, otherwise similar to dorsal sepal. Petals free, obovate to elliptic, often shorter and broader than sepals. Labellum free to base of column, trilobed, unspurred at base, much smaller than other perianth parts; lateral lobes free to base of column, midlobe flat; callus two- or three-ridged. Column with a foot; pollinia two, subglobose; stipe solitary, triangular to oblong; viscidium oblong, elliptic to lunate. Ovary cylindrical, grooved. (PC).