Differential selection in Juniper populations from the Baum limestone and Trinity sand of southern Oklahoma

The data suggest that, in S. Oklahoma, Juniperus ashei develops plentifully in areas where soil moisture is low enough to limit J. virginiana. Since the habitats of the two species overlap, hybridization occurs, but only those hybrids survive that are adapted to intermediate habitats. These are rich sources for confirmed hybridization and introgression.