A. Subalpine forest zone in the northern Sierras: conifer-forest chaparral m 



foreground; Mount Lassen in the distance. 



B. Secondary thicket growth of Quercus kelloggii and (J. garryana, with relicts 



of Pinus ponderosa and Pseudotsuga mucronata. South Fork Mountain. 

 Trinity County. 



C. Conifer-forest chaparral association: Arctostaphylos patida, A. nevadensis, 



Castanopsis sempervirens, Ceanothus velutinus, Quercus vaccinifolia, Amel- 

 anchier alnifolia; remnants of climax forest. Near Mount Lassen, northern 

 Sierras. 



