Douglas fir and aspen forest

Douglas fir and aspen forest is a plant community or vegetation type of the mountains of the western United States, dominated by Douglas fir (Pseudotsuga menziesii) and Quaking aspen (Populus tremuloides).[1]

References
  1. Spatial patterns of Douglas-fir and aspen forest expansion; Sankey, Temuulen Tsagaan; New Forests;Jan2008, Vol. 35 Issue 1, p45
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