the majority of australian species (30) of the genus callistemon gave leaf essential oils with 1,8-cineole as the major component (45-80%). other compounds present in these species included -pinene (2-40%, the majority being 2-8%), limonene (2-9%, the majority being 5-8%) and -terpineol (1-13%, the majority being 5-10%). the species that produced these oils did so in oil yields of 0.1-1.0%. the species giving very low oil yields (<0.1%), viz. c. brachyandrus, c. montanus, c. polandii, c. teretifolius, c. sp. (walsh's pyramid p.i. forster 13767), c. sp. nov. "oakey," c. pachyphyllus, as a general rule, produced oils in which the amount of 1,8-cineole was low (<20%) and generally there was a preponderance of sesquiterpenes.