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A large genus of shrubs and climbers, mostly tropical, only three species of which are hardy. Leaves opposite. Flowers in wide, cymose or corymbose clusters. Corolla slender-tubed, five-parted at the mouth. Calyx at first bell-shaped or inflated, persistent, becoming fleshy, with the sepals reflexed. Stamens four. Fruit fleshy, and highly coloured.