Epiphytic herbs. Stem up to c. 20 cm long, simple or branching, rooting at base, leafy. Leaves distichous, ensiform, flattened. Inflorescence lateral, axillary, borne from upper portion of stems, one-flowered, sometimes four or five flowers open simultaneously in succession per stem; floral bracts less than 1/8 the length of pedicel, brownish. Flowers up to 1 cm in diameter, usually opening widely, sepals and petals white, less often yellow or greenish yellow, labellum white, sometimes with a yellow central patch at base of midlobe. Sepals and petals free, spreading. Sepals narrowly elliptic, acute. Petals broadly elliptic and obtuse or narrowly oblong and subacute. Labellum trilobed, pandurate, spurred or slightly saccate, constricted near middle, hypochile canaliculate, thickened at the margins, margins erect, epichile transversely elliptic, emarginate with a broadly triangular tooth in sinus, or rounded, thick; spur (when present) narrow, shallowly conical, entrance glabrous. Column foot absent; anther apically elongate, pollinia four, ovoid, unequal, viscidium transversely elliptic, stipe linear; rostellum finger-like.