Overview
Small to massive monopodial epiphytes and lithophytes. Stems erect to pendent with upturned apices, leafy, rooting towards the base. Leaves numerous, alternate, distichous, strap-shaped, irregularly toothed at the apex, v-shaped in cross-section, leathery. Inflorescences axillary racemes, rarely branched, shorter than the leaves or long-scapose and longer than the leaves, laxly few-flowered to densely many-flowered. Flowers showy, usually fragrant. Sepals and petals free, spreading, subsimilar, subequal or the petals wider, often clawed, often with undulate margins. Lip three-lobed, saccate-spurred, fused to the column foot, the midlobe often flexibly hinged, the spur projecting backwards parallel to the column. Column short, stout, fleshy, often lobulate at the base, the foot short; pollinia 2, notched, on a common oblong stipe and large viscidium.