U. S. GEOLOGICAL SURVEY BULLETIN 845 PLATE 31 
A. BLOSSOMS OF PRICKLY PEAR CACTUS (NOPAL), SALT RIVER VALLEY NEAR 
PHOENIX, ARIZ 
ea 
B. SUPERSTITION MOUNTAIN, ARIZ. 
From point near Apache Trail, 28 miles eas ,0enix, lookir Ocotillo on right; giant 
cactus tn in center, oan ri lt Se and wine aie a ‘aa ssert plants 
