. Bulletin of the Department of Agriculture. Agriculture; Agriculture -- United States. BULLETIN OF THE D No. 154. Contribution from the Forest Service, Henry S. Graves, Forester January 14, 1915, THE LIFE HISTORY OF LODGEPOLE PINE IN THE ROCKY MOUNTAINS. By D. T. Mason, Assistant District Forester, District 1. GEOGRAPHIC DISTRIBUTION AND ALTITUDINAL RANGE. Loclgepole pine (Pinus contorta Loudon) is one of the most widely distributed western conifers. Its botanical range, shown in figure 1, extends from the Yukon Territory southward through the Cas- cade, Sierra Nevada, and San Jacinto Mo
. Bulletin of the Department of Agriculture. Agriculture; Agriculture -- United States. BULLETIN OF THE D No. 154. Contribution from the Forest Service, Henry S. Graves, Forester January 14, 1915, THE LIFE HISTORY OF LODGEPOLE PINE IN THE ROCKY MOUNTAINS. By D. T. Mason, Assistant District Forester, District 1. GEOGRAPHIC DISTRIBUTION AND ALTITUDINAL RANGE. Loclgepole pine (Pinus contorta Loudon) is one of the most widely distributed western conifers. Its botanical range, shown in figure 1, extends from the Yukon Territory southward through the Cas- cade, Sierra Nevada, and San Jacinto Mountains to northern Lower California, and through the main range of the Rocky Mountains to northern Xew Mexico. Its commercial range, however, is much more restricted. At present loclgepole is being lumbered exten- sively only in Montana, Wyoming, Colorado, and the Uinta Moun- tains in northeastern Utah. Large areas also occur in Idaho, Wash- ington, Oregon, and California, but in these regions the tree is rendered less important commercially by the presence of other and more valuable timber trees. The " lodgepole region "—that in which lodgepole is the preemi- nently important species—is mountainous, frequently interrupted by broad, open valleys, or plains, partly fertile and devoted to farming, and in part suitable only for grazing. The forests, as a rule, are con- fined to the mountains. The altitudinal range of lodgepole pine in the Rocky Mountains decreases from south to north. In Colorado and southern Wyoming the tree is found at altitudes ranging from 7,000 feet to timber line, or 11,500 feet; in northern Wyoming at from 6,000 to 10,500 feet; and in southwestern and central Montana at from 4,500 to 9,000 feet. As a rule, however, it forms commercial stands only within an altitudinal belt from 2,000 to 2,500 feet in width. In Colorado the best stands are usually between 7,500 and 9,500 feet; in Wyoming between 7,000 and 9,000 feet; and in southwestern and ce
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