Erect epiphytic herbs with approximate monophyllous pseudobulbs. Leaves subcoriaceous to coriaceous or sometimes fleshy, usually elliptic-lanceolate to ligular, rarely narrowly linear or semiterete. Inflorescences slender, short or elongate, erect, arching or pendulous, 1-to 7-flowered scapes produced from the bases of the pseudobulbs. Flowers usually large and attractive. Sepals narrow, widely spreading, often twisted, usually subequal and free, the laterals sometimes connate at the base, rarely as far as the middle. Petals subequal to the dorsal sepal. Lip entire or 3-lobed, clawed at the base and adnate to the base of the column, the limb spreading or the lateral lobes convolute and forming a tube, the mid-lobe spreading, the disk smooth or lamellate. Column erect, semiterete, the margins of the apex projecting, entire or lobed, usually dentate or fimbriate, the base of the column without a foot. Anther terminal within the clinandrium, operculate, incumbent, 1-celled; pollinia 2, waxy.
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