TO THE COCO-MARICOPA VILLAGES. 189 
who has paid particular attention to the cactacea of 
North America. 
Petahaya. 
This curious plant is found on the high table-lands 
on either side of the Gila, and in various parts of the 
State of Sonora, growing often in the crevices of rocks, 
and in other situations where it would seem difficult 
for any vegetable production to find sustenance. The 
orms it assumes are various; sometimes rising like a 
simple fluted column, although more frequently it is 
furnished with several branches, which, after leaving 
the main trunk, turn gracefully upward and rise paral- 
