Herbs, terrestrial, holomycotrophic. Rhizome tuberous, fusiform to oblong, fleshy, noded, lacking roots. Stem erect, with scalelike or tubular sheaths at nodes, white with violet streaks, leafless, glabrous. Inflorescence terminal, racemose, with a few to many well-spaced flowers; floral bracts lanceolate. Flowers usually pendulous, resupinate, not opening widely, white with violet markings; pedicel and ovary short, conic. Sepals and petals free, connivent, similar, lanceolate; lip similar to petals but wider, entire, concave, margin undulate and incurved, ecallose, with 2 glands at base, not spurred. Column stout, fleshy, lacking a column foot; anther suberect, borne on a broad filament arising from back of column; pollinia 2, clavate, granular-farinaceous, with a long common caudicle and attached to a small common viscidium; stigma exserted, continuous with rostellum. Capsule maturing rapidly.
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