abstract the oils of tristaniopsis collina, t. exiliflora, t. laurina and tristania neriifolia produced from plants harvested in australia were analyzed by gc and gc/ms. the oil of t. collina contained -pinene (trace-35-9%), myrcene (5.6-29.3%) and cubenol (0-16.6%) as major components. the oil from t. exiliflora contained -caryophyllene (13.4%) and -cadinene (16.4%) as major components. t. laurina was a variable species. one sample which produced an oil in poor yield, contained -pinene (79.4%) as the major component whereas a second sample possessed an oil rich in limonene (13.0%) and globulol (9.7%). some samples did, however, contain -, - and -eudesmol, spathulenol and globulol which amounted to almost 50% of the oil. tristania neriifolia gave an oil rich in -pinene (24.4%), -eudesmol (17.8%), -eudesmol (17.2%) and -eudesmol (28.0%). key word index: tristaniopsis exiliflora tristaniopsis laurina tristaniopsis collina tristania neriifolia myrtaceaeessential oil composition-pinene-pinenemyrcene-caryophyllenecubenol-cadinenelimonene-eudesmol-eudesmol-eudesmol