Hybridization of a native species with an exotic species can pose threats to the natives through homogenization/replacement of the native genotypes. The native Red Mulberry (Morus rubra) and the exotic White Mulberry (M. alba) co-occur in eastern North America, both species are reported to undergo hybridization. Through the genetic fingerprinting, we will find out whether hybridization occurs and determine how it affects the integrity of the native Red Mulberry.