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DescriptionErect or climbing shrubs, with milky latex. Leaves in whorls of 3-4, sometimes opposite, entire. Flowers bisexual, large and showy. Inflorescences of lax few-flowered racemes at the ends of the branches. Calyx deeply 5-lobed. Corolla campanulate-funnelform, yellow, pink or purple; tube cylindric with hairs or hairy scales at throat. Stamens inserted at mouth of corolla tube; anthers not united with the stigma. Ovary 1-locular; ovules many. Fruit a spiny capsule, splitting into 2 valves. Seeds many, flattened, winged.