Epiphytic herbs. Roots not piercing leaf-sheaths. Stems usually pendent, leafy. Leaves overlapping, distichous, conduplicate, oblong to lanceolate, apex unequally bilobed or premorse, articulate to an amplexicaul, sheathing base, spreading in one plane, deciduous. Inflorescence lateral, racemose, few- to many-flowered, usually pendent. Flowers resupinate. Sepals and petals free, similar, concave, lateral sepals slightly oblique. Petals slightly smaller than sepals. Labellum rigidly attached to column base, funnel-shaped, spurred, trilobed; side lobes suberect, midlobe fleshy, adaxially concave; spur hooked or curved, often abruptly swollen near apex, without interior callosities. Column terete, bent down over spur entrance, foot absent; anther cap conical, apex elongate and narrowed, pollinia two, waxy, globular, deeply cleft, separated by a hyaline flange, attached by a common long, linear stipe to a viscidium, stipe wings borne on a ridge formed by basal part of rostellum; rostellum beaked.