rarely epiphytic or lithophytic herbs. Stem cylindric to pseudobulbous, fleshy.
Leaves few to several, thinly textured to fleshy, plicate, petiole sheathing at
base. Inflorescence terminal, erect, unbranched; floral bracts lanceolate,
persistent, recurved. Flower green, brown, yellow, pink, or purple. Sepal
spreading, free. Petals often narrower than sepals, free, spreading; lip erect,
flat, usually concave at base, entire to lobed, auriculate or not at base,
margin entire or toothed, spur and callus absent. Column with 2 apical arms,
foot absent; anther cap movable, flattened; pollinia 4, equal in size, waxy;
stigma elliptic; rostellum obtuse or rounded at apex.