Epiphytic herbs. Stem enclosed in basal leaf-sheaths. Leaves 1–6, basal, distichous, flat, narrowly oblong to lanceolate, twisted at base so as to lie in one plane, apex often unequally bilobed, articulate and short-sheathing at base. Inflorescences lateral, usually shorter than leaves, often many borne simultaneously on a plant, usually erect; peduncle longer than rachis, both usually pricklyhairy, with 1–6 flowers open at a time; floral bracts persistent. Flowers resupinate, 0.5–1.5 cm across, ephemeral, opening successively, widely opening. Sepals and petals free, similar, spreading. Petals narrower than sepals. Labellum motile on column foot or rigidly attached to base of column, usually trilobed, spurred, side lobes narrow, erect, midlobe often replicate on spur, sometimes with two basal lobules on both sides, with a median tooth, giving a ‘four-lobed’ appearance; spur prominent, usually spreading at open end, rarely pendent. Column bent forward at an obtuse angle at base of stigma, as long as or longer than column foot, or foot absent; pollinia two, waxy, subglobular to ovoid, entire, or rarely four and the pollinia then completely split into two unequal bodies, each of the pollinia often attached to stipe by an auriculate caudicle, stipe cuneate or narrowly triangular-cuneate to spatulate, viscidium triangular or ovate; rostellum beaked.