Morning glories occur in the tropics of the world although some species also reach temperate zones.
The greatest species diversity occurs in the Americas and Africa. Bonamia , Ipomoea , Merremia , and Operculina are genera that are distributed throughout the tropics. Family Classification . These groups are subdivided into several tribes. Since the 1890s most people have recognized tribes Argyreieae, Convolvuleae, Cresseae, Dichondreae, Erycibeae, Hildebrandtieae, Ipomoeeae, and Poraneae.