The Douglas Fir is Washington's best known tree. It is the nation's number one lumber tree. Surprisingly, it is not Washington's state tree. Oregon got there first and claimed it as their state tree. Washington's state tree is the Western Hemlock.
Maybe that's not so bad when you consider that the Douglas Fir is not a fir at all. It's botanical name is Pseudotsuga menziesii or - false hemlock. The specific name honors Archibald Menzies, the English botanist who visited Puget Sound in the 1790's.