"Australian production is from E. polybractea and E. radiata var. `Australiana', while almost all the cineole-type oil produced in other countries is from E. globulus ... The most commonly traded eucalyptus oil is that obtained from E. globulus. This oil is readily available because of large-scale planting of E. globulus primarily for wood. These trees now also produce oil in commercial quantities. Oil of more character is obtained from E. polybractea, which also gives better yields and is suitable for mechanical harvesting. The strong lignotuber developed by this species allows coppice growth to be harvested frequently—at about 18-month intervals. This growth can be harvested at ground level."
http://www.rirdc.gov.au/pub/handbook/eucalyptoil.html
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