- Genus Pseudotsuga, family Pinaceae: several species, in particular the common Douglas fir (P. menziesii) of British Columbia and the western US.
- In Washington, they are generally found in mature Ponderosa pine, Douglas fir, or mixed coniferous forests with a thick understory.
- The three worked closely together to ensure that the new landscape would harmonize with a surrounding woodland of aspens, Douglas firs, ponderosa pines, and river birches.
- Lush forests of Douglas firs, Sanqing pine trees and Chinese yew once provided a haven for the Taiping Rebellion in the mid 1800s and communist guerrillas during the 1930s.
Mid 19th century: named after David Douglas (1798–1834), the Scottish botanist and explorer who introduced it to Europe from North America.
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Syllabification: Doug·las fir
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