Tall terrestrial herbs with leafy, often branched stems. Leaves narrow, many-nerved, inarticulate. Inflorescence terminal, racemose, many-flowered. Flowers small to medium-sized, resupinate. Sepals spreading, the dorsal free, the laterals connate nearly to their apices. Petals smaller than the sepals, free. Lip calceiform, saccate. Column short, terete. Fertile stamens 2, the third stamen (staminodium) sterile. Stigma wider than the staminodium, papillose, trisulcate. Capsule fusi-form, trilocular, crowned by the marcescent perianth.
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