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DescriptionTerrestrial (rarely lithophytic) herbs, with underground rhizomes, pseudobulbs or tubers. Leaves usually present and green but in some species reduced or scale-like and brown; green leaves sheathing at base, sometimes with prominent longitudinal veins. Inflorescence arising from the base, usually racemose, rarely branched. Sepals and petals similar or with the petals much broader, free to the base or with lateral sepals fused at the base to the column-foot. Lip 3-lobed, spurred at base, usually with a callus of ridges or papillae on upper surface. Pollinia 2.