Herbs, epiphytic, scrambling, monopodial. Stems erect to pendulous, climbing or pendulous, elongate, terete, branching or unbranched, many noded, laxly many leaved. Leaves terete, fleshy, channeled adaxially, jointed and sheathing at base; sheaths thickly leathery, tightly enclosing stem, persistent. Inflorescence axillary, 1-to several flowered. Flowers flat, large. Sepals and petals subsimilar, free, spreading. Petals usually larger; lip continuous with column foot, immovable, spurred, 3-lobed; lateral lobes ± erect, either parallel to or embracing column; mid-lobe often dilated and 2-or 3-lobed at apex; spur funnel-shaped or conic to long horn-shaped. Column subterete, short, fleshy, foot short; rostellum elongate, slender; pollinia waxy, 2, shortly cleft, attached by a broadly triangular or subquadrate stipe to a large viscidium.
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