Pines 



235 



The old trees, as a rule, develop a broad, umbrella -shape or spreading 

 crown, except some of the western pines, which, at least in their native 



Fig. 74. — Mexican White Pine. Pinus Ayacahuite Ehrenb. 



mountam climate, preserve a conical outline throughout. The yellow 

 pines generally are not as rapid growers as the whke pines, and more 

 hght-needmg but adaptive to poorer soils. For single specimens on 



