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Journal of Agricultural Research 
Vol. XXVIII, No. 8 
GILA VALLEY 
The two most important types of vegetation, namely, the creosote bush and 
desert-sage associations, are the same as and occupy similar positions to those 
in the Coachella Valley. The creosote bush covers the fans and higher benches 
LEGEND- 
Fig. 2. —Map showing the plant communities in Coachella Valley. The Jmap is carried only to the 
base of the foothills, above which there is a very irregular area of yucca and cactus. Coachella Valley, 
Calif., 1915. 
next to the mountains and the desert-sage occupies the adjoining lower lands 
having a soil of finer texture with the particles more weathered. The change of 
slope is much more gradual than in Coachella Valley, and hence the changes in 
soil conditions, texture, moisture, and salt content are less abrupt. There are 
