Abstract
Three populations of red oaks (Quercus subgenus Erythro- balanus) with narrow geographic distributions and low taxonomic diversity were studied by cluster analysis and principal component analysis. They wvere selected because each includes apparent hybrids. Cluster analyses were prepared based on 63 characters. The similarity matrix for each population was subjected to a principal component analysis, and the first three extracted factors were plotted against each other. The results, compared to those of other studies involving hybrids, support the hypothesis that hybridization is occurring within these populations as indicated by the intermediate characteristics of the putative hybrids.
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