abstract the chemical composition of the leaf oils of psidium cymosum urb. and psidium sartoranum niedz. were studied by gc/ms. thirty-three volatile compounds were identified in p. cymosum, of which t-cadinol (46.6%), 1,8-cineole (15.0%) and -muurolol (11.8%) were the major ones. twenty-one volatile compounds were identified in p. sartorianum, of which limonene (43.0%) and -pinene (39.5%) were the major ones.