The majority of Australian species (30) of the genus Callistemon gave leaf essential oils with 1,8-cineole as the major component (45â80%). Other compounds present in these species included Î±-pinene (2â40%, the majority being 2â8%), limonene (2â9%, the majority being 5â8%) and Î±-terpineol (1â13%, the majority being 5â10%). The species that produced these oils did so in oil yields of 0.1â1.0%. 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. âOakey,â 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.