Abstract
An introgressed population of Sabatia spp. exists on a sloping, edaphic cline. A stepwise discriminant analysis of 10 morphological characters of 150 individuals from the incline indicates the presence of introgression when compared with a reference population of each species. The results of horizontal starch gel electrophoresis for 6 enzyme systems encompassing 7 loci confirm that introgression has occurred and can be identified.