Since the 1890s most people have recognized tribes Argyreieae, Convolvuleae, Cresseae, Dichondreae, Erycibeae, Hildebrandtieae, Ipomoeeae, and Poraneae. Several authors have suggested that the family most closely related to Convolvulaceae is the Solanaceae, while others nominate the Polemoniaceae or Boraginaceae. Number of genera and species . There are 55 genera and 1600-1700 species of Convolvulaceae. Features of the family.
Stems are either herbaceous or woody.
A few species root from the stems, notably Ipomoea batatas and Evolvulus nummularius . Vegetative parts have milky latex that may be inconspicuous or obvious. Leaves are alternate and commonly cordate in outline, but vary to hastate, oblong, or linear. Margins are unlobed or divided into palmate or pinnate divisions. Petioles vary from absent to longer than the leaf blades and are channeled on the upper surface.