SHREVE 



Plate 2 



A. South face of Santa Catalina Mountains viewed 7 miles from their base. Mount Lemmon is on right center. 

 In foreground is bajada vegetation of Covillea tridentata, Opuntia spinosior, and Isocoma hartwegi. 



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B. Extreme southwestern ridge of Santa Catalinas viewed from the north. In foreground is the bed of the Canada 

 del Oro, with individuals of Hymenoclea monogyra and a marginal fringe of Prosopis velutina and Chil- 

 opsis linearis. 



