Caespitose, epiphytic herbs without pseudobulbs, the linear, undivided, pseudomonopodial, foliaceous stems erect or pendulous, entirely enveloped in the short, equitant, distichously imbricating, coriaceous leaves. Inflorescences short 1-or 2-flowered scapes or sometimes abbreviated few-flowered panicles, produced from the upper leaf axils. Flowers of moderate size to small, usually yellow, on elongate, filiform pedicels, often subtended by conspicuous membranaceous bracts. Sepals subequal, free, spreading or with the laterals reflexed. Petals subequal to the sepals or broader. Lip usually complexly 3-lobed, rarely entire, usually conspicuously exceeding the sepals in length, the lateral lobes (if present) often linear, rather long, divaricate or antrorsely incurving, the mid-lobe variously 2-to 4-lobulate, the disk with a papillose, denticulate or tuberculate callus. Column very short, with two broad wings or auricles, the base without a foot. Anther terminal, operculate, incumbent, imperfectly 2-celled; pollinia 2, waxy.
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