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 
(Pi nus ponderosa), is found extensively over the western portion of 
{lie northern Great Plains area on the hills and rocky outcrops from 
the Little Missouri River and the Black Hills to the Rocky Moun- 
tains. It is an extremely hardy tree in its natural habitat, but as 
vet 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 pint. — The lodgepole pine (Pin/us murrayana) is found 
at low altitudes in the Rocky Mountains and in the outlying groups 
Fig. 5.— Spruce in a planting at the Northern Great riain> Field Station. Mandan. 
N. Dak. The row on the lpft center is blue spruce, the center ro^v is white spruce, and 
the one at the right is Black Hills spruce. 
of small mountain- in the Great Plains region where it is confined 
principally 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 taxi 'folia) 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 {Jurdperus virgw&ana) , 
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. 
