GRAZING RANGES IN SOUTHERN ARIZONA. 5 
areas of certain species, and probably of the associations, had been 
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Fic. 3.—Map of the Santa Rita Range Reserve, Ariz., showing the present distribution of the 
principal forage-plant associations: No. 1, The six-weeks-grass association. No. 2. The 
black-grama association. No. 3. The crowfoot-grama association. No. 4. The needle- 
grass association. No. 5. The oak belt. No. 6. The forested area. Those parts of 
the reserve upon which the mesquite (Prosopis velutina), the cat’s-claw (Acacia greggti), 
and other shrubs or low trees occur, more or less abundantly, are indicated by dots 
(No. 7) on the map. In the same way, the crosses (No. 8) and the check marks 
(No. 9) show where the tree cactus (Opuntia spinosior) and the cholla (Opuntia 
fulgida) are important members of the plant associations (Pl. I, fig. 2). 
region had been subjected, and that under the protection of the fence 
these plants have been and are still readjusting themselves to the 
normal ecologic conditions. Maps of this kind made at various in- 
