Abstract
Six taxa of western North American denticulate leaved junipers were collected and their volatile leaf oils analysed. Two chemical forms of J. californica (‘A’ and ‘B’) previously reported were found to differ considerably in their concentration of α-pinene, sabinene, β-pinene, camphor and 4-terpineol. However, principal co-ordinate analysis revealed that the chemical forms of J. californica were the most similar taxa in the group and considerably more similar than the two varieties of J. occidentalis are to each other. This group of junipers appears to consist of two major subgroups: (1) J. occidentalis; and (2) J. california, J. monosperma, J. osteosperma; with J. osteosperma being closely related to the northern form of J. californica (:A.) and J. monosperma being most closely related to the southern form of J. californica (‘B’).
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