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 
Fic. 74. —— Mexican White Pine Pinus Ayacahuite Ehrenb. 
mountain climate, preserve a conical outline throughout. The yellow 
pines generally are not as rapid growers as the white pines, and more 
light-needing but adaptive to poorer soils. For single specimens on 
