The role of 2-needle fascicles in the adaptation and evolution of ponderosa pine

@article{Haller2008TheRO,
  title={The role of 2-needle fascicles in the adaptation and evolution of ponderosa pine},
  author={Jeffrey R Haller},
  journal={Brittonia},
  year={2008},
  volume={17},
  pages={354-382}
}
Pinus ponderosa Dougl. ex P. & C. Lawson is an important forest tree in many areas of western North America. It ranges from the Pacific Coast to Nebraska, and fl'om British Columbia to northern Mexico. Not unexpectedly, geographic variants appear h'om one region to another within this vast range. Some of these variants are sufficiently well marked to be recognized formally as varieties or occasionally even as species by taxonomists. The race occurring in the central Rocky Mountains and in the… CONTINUE READING