Steam distillation of the leaf of a New England blackbutt, Eucalyptus sp. nov. aff. campanulata gave an essential oil rich in E-methyl cinnamate with trans-p-ocimene as minor component and methyl 2-methyl butyrate, apinene, cis-p-ocimene, Z-methyl cinnamate and a, p and y-eudesmol as trace constitutents. Interpopulational studies showed a 2-6 percent range in oil yield with 94-99% E-methyl cinnamate content. The potential for the commercial development of this species in both plantations and natural stands was assessed.