132 
The habitat of this plant is usually given as ‘‘ Arizona and 
Sonora.” ding t y own observations, however, it 
crosses the river into California at a point opposite the mouth of 
Bill Williams Fork ; how far it extends to the westward can not 
be stated. It is to be seen near the river on the Arizona shore 
at many points, and I was informed by miners that it was to 
be found. in the mountains south of Picacho in California, al- 
though this was not verified. The range of the suwarro is there- 
Fic. 32. Cluster of flowers at apex of stem ce suwarro (Cereus giganteus) near 
Tucson, Arizona, Photograph by Prof. F. E. Lloy 
fore known at the present time to include from about 27° N. in 
Sonora to 34°20’ in Arizona and extending westward into Cali- 
fornia. It is found in the Tonto basin in central Arizona, near 
the northern limit of distributio 
Th e cacti which were ene from — vicinity of 
Tucson, Arizona, in February, 1902, and adde the collec- 
tions in our conservatories included neice ae g to 14 feet 
