Coarse, epiphytic herbs. Stems ascending, enclosed by leafsheaths, with many nodes. Leaves linear-oblong to terete, coriaceous, distichous, apex bilobed, jointed and sheathing at base. Inflorescence racemose or paniculate, lateral, pendent, usually densely many-flowered. Flowers showy. Sepals and petals similar, broad, spreading; lateral sepals decurrent on column foot. Petals smaller than sepals. Labellum continuous with column foot, usually immobile, trilobed, spurred, side lobes decurrent on column, erect, midlobe often erose; spur narrowly conical or horn-shaped, bent forward, usually with swellings or calli inside. Column elongate, often broadened at apex, foot distinct; anther cap two-celled, beaked; pollinia waxy, two, subglobular, unequally cleft, attached by a long, slender stipe to a single, semicircular viscidium; rostellum well developed, bifid after removal of pollinia, porrect.