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Abstract
Much of the spruce occurring in western Montana is suspected of being hybrid derivatives from the introgression between Picea glauca and P. engelmannii whose botanical ranges overlap in Montana. These Montana populations were analyzed by chemosystematic methods; resins were collected from typical P. glauca (Manitoba) and typical P. engelmannii (Wyoming) populations and these were analyzed by vapor-phase chromatography, as were resins from western Montana populations. Monoterpene compositions were determined and through the calculation of ratios based on the percentages of limonene, myrcene, and beta phellandrene, a two-dimensional ordination was constructed of the typical and hybrid spruce populations. The methods provide a highly useful approach towards interpreting chemosystematic data collected from Picea populations in the northern Rocky Mountains.
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