Plants with sessile, undivided tuberoids. Leaves basal or cauline, or on separate sterile shoots. Inflorescence few to many-flowered. Bracts ± herbaceous, often recurved. Flowers not resupinate, variously colored. Tepals subsimilar, free or partly united at base. Labellum erect, hooded, 2-spurred or 2-saccate at base. Column slender, covered by the labellum; anther basally firmly united with the column, reversed, so that base is upper most; pollinia 2, sectile, with caudicles and separate, naked viscidia; stigma, as a result of the rotation of the anther, on top of the latter, flat or hooded; rostellum between stigma and anther-cells, 3-lobed. Ovary not twisted.