Quantitative variation in leaf pocket resin composition in Hymenaea courbaril

Leaf pocket resin sesquiterpenes have been quantitatively analyzed in 22 geographic populations of the widespread Hymenaea courbaril. Highly stable quantitative resin composition in Meso-American populations of H. courbaril contrasts with greater variability in several South American populations. In some of the latter, bimodality in quantitative content of several correlated sesquiterpenes results in overall resin compositional relationships of two or three distinct types. Variance-weighted similarity coefficients between all populational pairs are single-linkage clustered to visualize chemical relationships.