. Bulletin of the Department of Agriculture. Agriculture; Agriculture. SHELTER-BELT DEMONSTRATIOXS OX THE GREAT PLAIXS. 7 the region furnishes what is perhaps the most important source of material for shelter-belt planting. Figure 2 shows the native growth of western cotton wood, box elder, and green ash in the river bottom, with western yellow pine on the adjoining hills in the Yellowstone Eiver valley at Pompeys Pillar in southern Montana. Figure 3 is a view in the Turtle Mountains, Bottineau County, N. Dak., showing the native tree growth, consisting of cottonwood, l)alsam poplar, aspe
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. SHELTER-BELT DEMONSTRATIOXS OX THE GREAT PLAIXS. 7 the region furnishes what is perhaps the most important source of material for shelter-belt planting. Figure 2 shows the native growth of western cotton wood, box elder, and green ash in the river bottom, with western yellow pine on the adjoining hills in the Yellowstone Eiver valley at Pompeys Pillar in southern Montana. Figure 3 is a view in the Turtle Mountains, Bottineau County, N. Dak., showing the native tree growth, consisting of cottonwood, l)alsam poplar, aspen, white elm, bur oak, and green ash. The species that make up this native growth are of two general classes: Those which have progressed up the Mississippi-Missouri ] system from the east and those which have advanced down the western sources of this same svstem from the Eockv Fig. 3.—View in the Turtle Mountains, Buttini.'au County. X. Dal;. -Ii living native tree growth consisting of cottonwood, balsam, poplar, aspen, white elm, bur oak, and green ash. Beside these native trees a number of species have been introduced from other parts of the United States and Canada and from certain European and Asiatic countries. Some of these introduced species are fully as adaptable to shelter-belt use as any of the native species, while a number of the native trees can not be successfully trans- planted to the open plains. The following paragraphs give brief descriptions of practically all of the trees which have been used in shelter-belt planting in the northern Great Plains region. The list is not exhaustive, however, as there are a number of other species that can doubtless be made to grow, but about which little data are available at the present time. DECIDUOUS OR HARDWOOD SPECIES NATIVE TO THE REGION. Box elder.—The box elder {^Acer negundo) is found in practically all of the river valleys to the foothills of the Rocky Please note that these images
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