Plants autotrophic, with rhizome and loosely clustered roots. Stem leafy. Leaves sessile, plicate. Inflorescence loosely or densely many-flowered, rarely only 1-2-flowered. Flowers white, rose or creamy. Sepals and petals similar, free, connivent or ± spreading. Labellum with concave or shortly spurred basal half (hypochile) clasping the column, jointed to flattish, crested apical half (epichile). Column semiterete; anther dorsal, erect or ± incumbent, fixed with small filament; pollinia 2, bipartite, mealy, without caudicle; viscidium obsolete; rostellum absent; stigma entire. Ovary sessile, not or slightly twisted.