Tree species can often produce hybrids with other species. For centuries, plant breeding with hybrids has been conducted to produce new and improved varieties of food and ornamental plants. Evolutionary biologists, on the other hand, often view hybrids as a threat to the purity of a species. This study explores the theoretical implications of species evolving in a syngameon and the importance of the syngameon in the diversification of trees and in the maintenance of high genetic diversity. The theoretical work will lead to practical applications that will accelerate and enhance the ability of trees to adapt to rapidly changing environments.