Abstract: Hybridization in plants is thought to have an extremely important role in evolution.  Hybridization coupled with introgression, or movement of genes from one species to another via backcrossing of the hybrid population to the parent species, has been thought to lead to increased genetic diversity, the transfer of adaptations, and speciation.  This study looked at two species of  Monarda (Lamiaceae) and their hybrid populations in the Mountain Lake area, and addressed whether or not introgression between a known hybrid population and a parapatric population of M. clinopodia is occurring.  Specifically,  the study addressed the question of whether the M. clinopodia near the hybrid population is significantly different from populations of M. clinopodia not located near a hybrid or M. fistulosa population.  By taking morphological measurements in the field, I found genetic markers which differed significantly between  the two species (M. clinopodia and M. fistulosa) and the hybrid population.   I also found evidence of M. fistulosa characters present in the population of M. clinopodia located parapatrically to the hybrid population.  Results from this study also suggest that introgression between the two species, perhaps via hybrids, has played a role in other populations in the area.