J.J.Sm., Bull. Jard. Bot. Buitenzorg, II, 13: 47 (1914)
Epiphytic herbs. Stem leafy. Leaves few, clustered, ligulate or linearelliptic, often subfalcate, often twisted at base, unequally bilobed, fleshy, to 11 × 3 cm. Inflorescence lateral, emerging from base of leaf-sheaths, racemose, 3–8 cm long; rachis complanate, with one or two distichously arranged flowers opening in succession; floral bracts distichous. Flowers lasting for a day or two, white, cream, yellow or orange. Sepals and petals subequal, 1–2 cm long. Petals sometimes toothed. Labellum trilobed, rigidly attached to base of column, spurred, internal callosities absent, side lobes either well developed and truncate or reduced to ear-like lobes, when present often fimbriate or toothed; midlobe fleshy and solid or reduced to a fleshy lobe; spur ecallose and aseptate, often with raised edges near entrance. Column compressed dorsally, column foot absent; pollinia two, nearly round, entire, stipe broader below pollinia, often spatulate, 3–5 times the diameter of the pollinia; rostellar beaked; stigma covering almost the entire front side of column.