402 



FOREST TREES OF THE PACIFIC SLOPE. 



OCCURRENCE. 



Prefers north mountain slopes, in shelter of forest borders, gulches, ravines, but occurs 

 elsewhere on warm exposures ; in dry, or moderately moist, gravelly soils. In groups 

 or scattered among chaparral and shrubby trees. 



Fig. 190. — Rhamnus crocea. 



Climatic Conditions. — Climate hot and dry in part, but in part influenced by prox- 

 imity of sea. 



Tolerance. — Very tolerant of shade, as shown by its growth for years under dense 

 shade of tolerant trees. 



