Abstract Leaf oils of Pitaviaster haplophyllus (F. Muell.) T. G. Hartley were analyzed by GC and GC/MS. It was found that the oils were almost entirely sesquiterpenic in nature. The principal components of the oils were germacrene D (10â28%), germacrene B (1â30%), bicyclogermacrene (2â10%) and elemol (5â21%).