SEASONS IN SOUTHERN ARIZONA 



219 



tinue for a month, to be accompanied and followed by equally 

 noticeable bloom by two or three other small species. Chief 

 of the group, however, is the great sahuaro, the flower buds 



Fig- 



Flowfis of Cereus gigantevis. 



of which develop as dense clusters on the portions of the 

 apices of the stems most exposed to the sun, and have been 

 seen as early as March 24th, near Agua Caliente. The 



