Studies on pollen phenolic compounds and isozyme profiles of twelve species ofIpomoeato trace the linkage and homology between the species, through UPGMA method, revealed two broad clusters or groups. The trend of clustering and species composition of each group for both the parameters were close to each other and almost in accordance with phylogenetic interpretation with minor variations. The variations are probably due to the fact that phenolics and isozymes are different biomolecules.