A master's thesis in the Department of Ecology, College of Science at the University of Basra discussed the effect of cadmium and lead pollution on some phenotypic characteristics of Catharanthus roseus (L) G.Don and Trigonella foenum-graecum L. plants and their content of some active compounds.

The study by Orouba Heliji Muhammad aims to study the effect of pollutants on medicinal plants included the study of the effect of pollutants on medicinal plants and the extent of their effect on them.