Clinal differentiation and putative hybridization in a contact zone of Pinus ponderosa and P. arizonica (Pinaceae).

@article{Epperson2001ClinalDA,
  title={Clinal differentiation and putative hybridization in a contact zone of Pinus ponderosa and P. arizonica (Pinaceae).},
  author={B K Bryan K Epperson and Frank W. Telewski and Anne E. Plovanich-Jones and Joseph E. Grimes},
  journal={American journal of botany},
  year={2001},
  volume={88 6},
  pages={1052-7}
}
The widely distributed Pinus subsection Ponderosae is a species complex that has a transition zone among taxa in the southwestern United States. In southern Arizona and New Mexico at least two recognized taxa, Pinus ponderosa var. scopulorum and Pinus arizonica or P. ponderosa var. arizonica, are known to coexist in close proximity. In this study, we report the existence of populations where the taxa are sympatric. One of the key characteristics distinguishing taxa is the number of needles per… CONTINUE READING

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