The volatile leaf oils of Eucalyptus kochii subsp. kochii, E. kochii subsp. plenissima, and Eucalyptus oleosa var. borealis, potential Western Australian candidates for commercial eucalyptus oil production, were analyzed by means of GC, GC/MS, and IR. The three taxa were found to produce similar but distinctive individual distributions of leaf oil terpenoids. This supports their close botanical relationship. The oils consist mainly of monoterpenoids, with 1,8-cineole dominating to the extent of 80-90%. Approximately 55 other components were detected. The oils of Eucalyptus globulus and Eucalyptus kondininensis were studied also.
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Barton et al. (1989) studied this question.