[Chap. Lin THE VEGETATION OF NORTH AMERICA 



'71 



Fig. 397. Giant cactus and desert shrubs near Tucson, Arizona. Photo bv A. E. 



Waller. 



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Fig. 398. Desert vegetation on sand along the shore of the Gulf of California, 

 Libertad, Sonora. The cactus in the foreground is Opuntia bigelovii; in the back- 

 ground, Pachycereus pringlei. Note the osprey soaring in the background. Photo 

 by W. S. Cooper. 



