CLIMAX COMMUNITIES : PRESENT DISTRIBUTION 



273 



P. flexilis, and P. balfoiiriaiia. 2 * 1 On exposed, bare, rocky slopes, 

 Juniperus occidentalis is common at timber line and, especially on 

 the west slope, at much lower altitudes. 



The upper margin of the red fir forest does not commonly ex- 

 tend to timber line but, instead, grades into a relatively narrow 



Fig. 142. Giant redwoods (Sequoia gigantea) of the Calaveras grove, Se- 

 quoia, Calif— U. S. Forest Service. 



