Herbs, epiphytic, robust, monopodial. Stems scrambling, elongate, often to several meters, branched, leafy. Leaves oblong, rigid, somewhat fleshy or leathery, base sheathing, apex bilobed. Inflorescence lateral, ascending or pendulous, rigid, often long and branched, few to many flowered; peduncle and rachis slender. Flowers fragrant, resupinate, often large and showy, usually widely opening, often spiderlike. Sepals and petals similar, spreading, narrowly oblong to linear, usually widened toward apex; lateral sepals and petals often falcate-curved. Lip short, 3-lobed, jointed to column foot by a short movable strap, base saccate or spurred; mid-lobe with a raised, central ridge or callus; column short, stout; stipe short, broad; viscidium broadly ovate; pollinia 4, appearing as 2 unequal masses, waxy.
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