Epiphytic herbs. Stems usually covered by persistent leaf sheaths, bearing many distichous needlelike leaves. Leaves nearly terete, slightly sulcate on upper surface, articulated with sheath. Racemes axillary, few flowered; bracts shorter than pedicel and ovary. Flowers with spreading perianth; sepals subequal, lateral ones oblique; petals similar to sepals; lip sessile, spurred, 3-lobed, lateral lobes erect beside opening of spur, midlobe larger, spreading, flexible, with a wide sinus between base and lateral lobes, narrow at base, continuous with wall of spur, callose on disc; spur cylindrical, often curved; column footless, with small acute wings at apex; anther terminal, opercular, cucullate; pollinia 2, waxy, porate, attached by a narrow stipe to broad viscidium; stigma entire, rostellum bifid. Capsules cylindri-cal-fusiform.
About eight species, southern China, Myanmar, Indochina to Thailand. One species in Taiwan.