abstract the leaf oils of cymbopogon citratus (lemongrass), renealmia sp., and hyptis recurvata, and the cortex oil of tynanthus panurensis from peruvian amazon have been isolated by hydrodistillation and analyzed by a combination of gc and gc/ms. twelve, sixteen, and sixteen components have been identified in the leaf oils, accounting for 97.4%, 99.9% and 98.8% of the oils, respectively. the major constituents of the three leaf oils were found to be: c. citratus. geranial (49.9%), neral (30.9%) and geraniol (10.4%); renealmia sp.: -pinene (31.9%), 1,8-cineole (21.3%) and camphor (10.5%); h. recurvata: eugenol (68.8%) and 1,8-cineole (15.9%). the t. panurensis cortex oil was comprised of a single constituent: eugenol (99.9%).