Long considered undesirable for timber, white fir (Abies concolor) is finally being recognized as a highly productive, valuable tree species. White fir reaches its best development and maximum size in the central Sierra Nevada of California, where the record specimen is 58.5 m (192 ft) tall and measures 271 cm (106.6 in) in d.b.h. (7). Large but not exceptional specimens, on good sites, range from 40 to 55 m (131 to 180 ft) tall and from 99 to 165 cm (39 to 65 in) in d.b.h. in California and southwestern Oregon and to 41 m (134 ft) tall and 124 cm (49 in) in d.b.h. in Arizona and New Mexico (37).
Needle form and terpene content vary sufficiently across the wide range of the species to warrant definition of two varieties: the typical var. concolor, white fir, often called Rocky Mountain white fir, occupies the eastern and southwestern part of the range; var. lowiana (Gord.) Lemm., California white fir, grows in the western range (31). Zone 3.