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DescriptionPerennial herbs, mostly climbing or scrambling, sometimes erect, with tubers or fleshy or fibrous roots. Leaves opposite, simple, sometimes succulent. Flowers in umbel-like clusters, racemes or 1-several at the nodes. Sepals 5. Corolla tubular, usually with an inflated base; lobes free or connate into a cage or umbrella-like structure. Corona 2-seriate. Follicles fusiform. Seeds narrowly winged with an apical tuft of hairs.