Herbs, terrestrial, holomycotrophic, leafless. Rhizome subterranean, creeping, with a few widely spaced roots. Stem erect, cylindric, leafless, glabrous, with 2 or 3 sheaths at base. Inflorescence terminal, racemose, glabrous, densely many flowered; floral bracts persistent. Flowers very small, not resupinate, fleshy. Sepals similar, free. Petals usually shorter and narrower than sepals; lip superior, unlobed, concave. Column clavate, short; anther subterminal, 2-locular; pollinia 4, in 2 pairs, waxy, without caudicle, directly attached to a thick, oblong viscidium; rostellum stout, exserted, protruding beyond anther.
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