SHELTER-BELT DEMONSTRATIONS ON THE GREAT PLAINS, 



11 



is partly due to its being the outside row, farthest from the deciduous 

 trees. 



Western yellow pine. — The western yellow pine, or bull pine 

 (Pinus pcmderosa) ^ is found extensively over the western portion of 

 the northern Great Plains area on the hills and rocky outcrops from 

 the Little Missouri Eiver and the Black Hills to the Rocky Moun- 

 tains. It is an extremely hardy tree in its natural habitat, but as 

 yet has not been transplanted to prairie situations with much success. 

 It is probably suited to special localities, but present data do not 

 recommend it for general use. 



Lodgepole pine. — The lodgepole pine {Pinus murrayana) is found 

 at low altitudes in the Rocky Mountains and in the outlying groups 



Fig. 5. — Spruce in a planting at tlie Nortliern Great Plains Field Station, Mandan, 

 N. Dak. The row on the left center is blue sprace, the center row is white spruce, and 

 the one at the right is Black Hills spruce. 



of small mountains in the Great Plains region where it is confined 

 princii^ally to the northern slopes. It has proved adaptable for 

 shelter-belt planting in Alberta and Saskatchewan, Canada, but has 

 not yet been tested in the United States. 



Douglas fir. — ^The Douglas fir {Pseudotsuga taxifolia) extends east 

 from the Rocky Mountains in company with western yellow pine to 

 central Montana. It is found in the coulees, or " breaks," along the 

 Missouri River up to the very edge of the prairie. It may be classed 

 with the western yellow pine in adaptability for shelter-belt planting. 



Red cedar. — The red cedar, or juniper {Junipeims virginiiana) , 

 grows as a low, shrubby tree among the rough hills overlooking the 

 river valleys of the region. It is extremely hardy and makes good 

 growth when transplanted. It has not been used, however, for 

 shelter-belt planting to any extent. 



