Pseudotsuga menziesii var. glauca, also known as Rocky Mountain Douglas Fir, is an evergreen conifer species native to western North America. Its specific epithet, menziesii, honors Archibald Menzies, a Scottish physician and rival naturalist to David Douglas. This tree is often planted as a specimen or for mass screenings and is a popular choice for Christmas trees. Its useful wood and quick growth make it the crop of choice for many timber companies. Additionally, its seeds are an important food source for small mammals. Rocky Mountain Douglas Fir grows inland and replaces the coastal variety in the Cascades of northern Washington and southern British Columbia. It has a wide distribution, ranging from central British Columbia to the Mexican border, becoming increasingly disjunct as latitude decreases and its altitudinal limits increase. With its intriguing history and utilitarian properties, Pseudotsuga menziesii var. glauca is sure to impress any nature enthusiast or tree lover. Learn more about this fascinating tree at plants.usda.gov.