Abstract
Leaf oil terpene compositions from 55 western red cedar populations were analysed by discriminant and numerical analyses. The overall low intra- and interpopulational variability was confirmed, but small differences between coastal and interior populations were detected by canonical discriminant functions. There were also some minor differences between the populations from Vancouver Island and those near the Juan de Fuca Strait. No consistent correlations between northern and southern locations, elevation, or atypical morphology (branching), and terpene composition were found. Several outlier populations were indicated, but these were randomly distributed. It was concluded that discriminant analysis provided more detailed information than other treatments.
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