HYBRIDIZATION BETWEEN JUNIPERUS-ERYTHROCARPA CORY AND JUNIPERUS-PINCHOTII SUDWORTH IN THE CHISOS MOUNTAINS, TEXAS

Individuals from the Chisos Mountains, Texas, a population containing Juniperus erythrocarpa Cory, Juniperus pinchotii Sudw. and putative hybrids, were compared to J. erythrocarpa from west of Alpine, Texas, and J. pinchotii from northeast of Marathon, Texas, using morphological and terpenoid characters. Numerical analyses included weighted hybrid indices and principal coordinate analysis. These analyses were complementary in showing hybridization between J. pinchotii and J. erythrocarpa in the Chisos Basin population. The populations of J. erythrocarpa from west of Alpine and J. pinchotii northeast of Marathon were found to contain a few individuals intermediate in their chemistry and morphology, suggesting introgression.