Chemosystematic studies in the genus Pinus. IV. Leaf oil composition and geographic variation in jack pine of eastern North America

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Abstract
Leaf terpenes of 420 jack pines from 43 sites (Petawawa provenances) in eastern North America were analyzed by GLC. In most trees the major components were .alpha.-pinene, .beta.-pinene, myrcene, car-3-ene, limonene, .beta.-phellandrene and bornyl acetate. Eighteen other monoterpenes were identified and 13 sesquiterpenes were characterized by their spectral properties and GLC retention times. These data were analyzed by centroid cluster analysis of the mean-squared Euclidean distances, which showed that jack pine is a diverse species of 2 major terpene types with 8 minor types and a few outlying individual trees. With the exception that the minor clusters and outliers tend to occur at the fringes of the jack pine range, there is no obvious geographic pattern to these clusters.

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