The holotype plant was in a south facing area growing in association with "Pseudotsuga menziesii". Another variety exists further inland, "Pseudotsuga menziesii" var. Coast Douglas-fir ("Pseudotsuga menziesii" var. Red alder is associated with coast Douglas-fir "Pseudotsuga menziesii" subsp. Rocky Mountain Douglas-fir ("Pseudotsuga menziesii" subsp. Rocky Mountain Douglas-fir is most commonly treated as a variety ("Pseudotsuga menziesii" var. The Rocky Mountain Douglas-fir ("Pseudotsuga menziesii" var. Trembling aspen and Douglas-fir ("Pseudotsuga menziesii" var. They eat exclusively the needles of conifers, mostly Douglas-fir ("Pseudotsuga menziesii") and occasionally other species. In Washington and Oregon, marbled murrelets commonly nest in Douglas-fir ("Pseudotsuga menziesii") dominated stands. Pseudotsuga menziesii is an evergreen conifer species in the pine family, Pinaceae. Douglas-fir ("Pseudotsuga menziesii") communities in the western Cascade Range in Oregon. A Douglas-fir species, "Pseudotsuga menziesii", is the state tree of Oregon. Blue Oak ("Quercus douglasii") and Douglas-fir ("Pseudotsuga menziesii"). Douglas firs ("Pseudotsuga menziesii") provide the logging industry with a significant portion of their revenue.