The Arizona White Pine (P. strobiformis, ) Engelm., is scattered scantly over gravelly ridges and on canon sides in the southern part of New Mexico and Arizona, and on into Mexico. Its pale-green leaves and glaucous, downy branchlets blend it with the semi-arid landscape. Its scarcity and the inaccessibility of its habitat and range defend this tree from the lumberman, though it occasionally reaches the height of 8o feet or more, and a trunk diameter of 2 feet.