any of a genus (Ipomoea) of plants of the morning-glory family; esp., a twining annual vine (I. purpurea), with heart-shaped leaves and trumpet-shaped flowers of lavender, blue, pink, or white
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adjective
designating a family (Convolvulaceae, order Solanales) of twining dicotyledonous vines and some erect shrubs and trees with flowers having five sepals and a funnel-shaped corolla, including some bindweeds and the jalaps and sweet potatoes
See morning glory in American Heritage Dictionary 4
noun
Any of numerous, usually twining vines of the related genera Argyreia, Calystegia, Convolvulus, Merremia, and Ipomoea, having funnel-shaped, variously colored flowers that close late in the day.