J.J.Sm., Bull. Jard. Bot. Buitenzorg, II, 26: 93 (1918)
Epiphytic herbs. Leaves few, oblong-lanceolate, obtusely bilobed, thin-textured. Inflorescence lateral, few- to many-flowered, racemose, rarely subpaniculate, producing flowers at intervals facing apex of raceme, lasting at least two days, generally green; peduncle sometimes thickened and angled near apex. Flowers thin-textured. Sepals and petals oblong or obovate, ringent. Petals slightly shorter than sepals. Labellum firmly adnate to base of column, trilobed, saccate or spurred, with a wide, broad opening, lacking interior ornamentation, although a transverse ridge sometimes separates spur from midlobe, side lobes generally erect, sometimes rudimentary, midlobe variable, from concave to convex; spur in line with column, cylindrical or cornute. Column cylindrical, with narrow apical wings, column foot absent; anther cap cucullate, narrowly rostrate, pollinia four, unequal, on an elongate stipe; rostellum porrect from apex of column, elongate, bifid at apex.