Pseudotsuga menziesii, known as Douglas-fir, Oregon Pine, or Douglas spruce, is an evergreen conifer species native to western North America. One variety, coast Douglas-fir (Pseudotsuga menziesii var. menziesii), grows in the coastal regions, from west-central British Columbia, Canada southward to central California, United States. Pseudotsuga taxifolia, The wood is used for dimensional lumber, timbers, pilings, and plywood. Creosote treated pilings and decking are used in marine structures. The wood is also made into railroad ties, mine timbers, house logs, posts and poles, flooring, pulp, and furniture. Coast Douglas-fir is used extensively in landscaping. The benzene-soluble, n-hexane-insoluble extract from the bark of Pseudotsuga menziesii (Mirb.) Franco was found to contain a number of n-fatty acids and α,ω-dicarboxylic acids ranging in chain length from 16 to 28 and 16 to 24 carbons, respectively.