The minor venation pattern in certain species provides taxonomic and evolutionary clues. Foliar venation patterns act as device for the identification of various species in the present investigation minor leaf venation pattern of 16 South Indian species of Ipomoea were studied. The study reveals that the Ipomoea species shows simple, linear curved, once, twice and thrice branched minor leaf venation with polygonal leaf areole. Size of the leaf areole is concerned highest length and breadth is reported in I. coptica