306 



FOREST TREES OF THE PACIFIC SLOPE. 



miles northwest of Pasadena, Long Canyon, and at point 1J miles southwest of Straw- 

 berry Peak, at 3,200 feet. Frequent in Trabuco Canyon National Forest (Orange 

 County), in nearly all canyons, except at highest elevations. Occurs on a number of 

 coast islands, probably on all except San Clemente. Southward it grows in a belt about 

 50 miles wide, extending westward to within 15 or 20 miles of coast, and eastward to 

 west slope of mountains, but probably not reaching San Jacinto Mountains, though o*: 

 curring in Palomar and Balkan mountains, and widely over Cuyamaca Mountains ; here 

 going eastward to Jacumba Hot Springs (2,822 feet elevation.) Locally noted near 

 Mexican boundary in San Diego County at Alpine, 2,275 feet elevation, and Pine Valley, 

 at 4,200 feet. 



Lower California. — More or less common in low canyons on west side of Mount San 

 Pedro Martir ; occurs here in Encinas Canyon (near San Tomas) and at San Antonio, 

 at 3,000 feet, and on Santa Cruz Creek. 



Fig. 140. — Querctts aprifolia. 



OCCURRENCE. 



Characteristic on low hills and open valleys, slopes of higher foothills, shallow canyons, 

 in dry loamy or gravelly soils; also (but stunted) on exposed seashore. 



Forms extensive, pure, open forests, and is also mixed with valley oaks, blue oak, 

 Wislizenus oak, and big-cone spruce, and occasionally with canyon live oak, California 

 sycamore, and white alder. 



Climatic Conditions. — Similar to those of Monterey pine. 



Tolerance. — Very tolerant of shade throughout life. 



Reproduction. — Prolific periodic seeder, but reproduction generally scanty. 



