Amabilis Fir, Cascade Fir, Lovely Fir, Pacific Silver Fir, Silver Fir: Abies amabilis - Generally found west of the eastern base of the Cascade Mountains.
California White Fir, Sierra White Fir: Abies concolor x Abies grandis (Synonyms: Abies concolor, Abies concolor var. concolor, Abies concolor var. lowiana, Abies lowiana)
Grand Fir, Lowland Fir, Lowland White Fir, Stinking Fir: Abies grandis (Synonyms: Abies grandis var. grandis, Abies grandis var. idahoensis, Pinus grandis)
Alpine Fir, Balsam Fir, Subalpine Fir, White Balsam Fir: Abies lasiocarpa var. lasiocarpa (Synonyms: Abies blasamea ssp. lasiocarpa, Abies balsamea var. fallax, Abies bifolia, Abies subalpina, Pinus lasiocarpa)
California Red Fir, Shasta Red Fir: Abies magnifica x Abies procera (Synonyms: Abies magnifica, Abies magnifica var. magnifica, Abies magnifica var. shastensis, Abies xshastensis)
Noble Fir, Red Fir, White Fir: Abies procera (Synonym: Abies nobilis) - Generally found west of the eastern base of the Cascade Mountains.