UNIV. CALIF. PUBL. ZOOL. VOL. 5 [GRINNELL] PLATE 23 
A pinyon (Pinus monophylla) growing in the chaparral belt at 5700 feet altitude on the south- 
facing north wall of the upper Santa Ana. At this same altitude on the opposite wall 
of the Santa Ana two miles away is a dense forest of silver fir, yellow pine, and black 
oak. 
