Abstract The chemical composition of a volatile concentrate of the flowers of Thevetia peruviana and Allamanda cathartica were analyzed by GC/MS. The main volatile components identified in the flowers of T. peruviana were palmitic acid (22.9%), (E)-Î²-ionone (17.2%) and 1,8-cineole (10.6%). The major volatiles of the flowers of A. cathartica were linalool (39.3%), dendrolasin (20.2%) and Î²-caryophyllene (15.7%).