Large or small, terrestrial, reed-like herbs. Leaves pergameneous, plicate-veined, petiolate, usually few. Inflorescence a terminal or axillary raceme or panicle. Sepals equal or nearly so, connivent or somewhat spreading. Petals similar to the sepals but narrower and shorter. Lip erect from the base of the column and adnate with it toward the base along the median line, broader than the sepals and petals, enfolding the column, retuse or 3-lobed; the disc pubescent or glabrous, callused. Column elongated, slender, more or less arcuate, footless; anther incumbent, operculate, the terminal part fleshy and sterile; pollinia 4, pyriform, granular or subceraceous.
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