Abstract
The composition of the leaf essential oils of ten populations of Juniperus excelsa complex in Iran are reported and compared. Hydrodistillation yielded in 0.08%–3.78% dry weight (v/w) clear oils among populations studied. The oils are mostly dominated by α- Pinene, Limonene and β-Myrcene. The simplest oil was found in Qushchi (J. polycarpos var. polycarpos) with 25 components and the most complex oil was found in Lushan1 (J. polycarpos var. polycarpos) with 92 components. Quantitative data is presented for 164 components were found. The southern populations, Fasa and Khabr, show differences in composition of essential oils compared with other populations so that Borneol and isopinocamphone are diagnostic for them. These populations have been identified as Juniperus seravschanica in southeast of Iran and hybrid samples between J. polycarpos and J. seravschanica in southwest of Iran whereas other populations, as is confirmed in this study, are J. polycarpos. It is confirmed by essential oils data that there is no J. excelsa in Iran.
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