Abies concolor, the white fir, is a coniferous tree in the pine family Pinaceae. This tree is native to the mountains of western North America, including the Cascade Range and southern Rocky Mountains, and into the isolated mountain ranges of southern Arizona, New Mexico, and Northern Mexico. It naturally occurs at elevations between . It is popular as an ornamental landscaping tree and as a Christmas tree. Description This large evergreen conifer grows best in the central Sierra Nevada of California, where the record specimen was recorded as tall and measured in diameter at breast height (dbh) in Yosemite National Park. The typical size of white fir ranges from tall and up to dbh. The largest specimens are found in the central Sierra Nevada, where the largest diameter recorded was found in Sierra National Forest at (1972); the west slope of the Sierra Nevada is also home to the tallest specimen on record, in height. Abies concolor subsp. concolor (Rocky mountain white fir) rarely exceeds tall or dbh. Large (but not huge) trees in good soil range from tall and from dbh in California and southwestern Oregon and to tall and dbh in Arizona and New Mexico. The dead tree tops sometimes fork into new growth. The gray bark is usually at least thick, and brown-hued inside. The leaves are needle-like, flattened, long and wide by thick, green to glaucous blue-green above, and with two glaucous blue-white bands of stomatal bloom below, and slightly notched to bluntly pointed at the tip. The leaf arrangement is spiral on the shoot, but with each leaf variably twisted at the base so they all lie in either two more-or-less flat ranks on either side of the shoot, or upswept across the top of the shoot but not below the shoot. The cones are long and broad, green or purple ripening pale brown, with about 100–150 scales; the scale bracts are short, and hidden in the closed cone. The winged seeds are released when the cones disintegrate at maturity about 6 months after pollination. White fir can live over 300 years. Subspecies As treated here, there are two subspecies; these are also variously treated at either the lower rank of variety by some authors, or as distinct species by others: Botanical collection White fir was first collected by Augustus Fendler on his expedition to the Santa Fe area of New Mexico in 1846–1847. Fender's