Rocky Mountain White Pine 



II 



year; the cone-scales are about 5 cm. long, blunt, sUghtly thickened at the tip, 

 but without any spine or prickle; the seeds are 12 to 15 mm. long, the blunt and 

 rather broad wing somewhat longer than the body. 



The wood of the Sugar pine is largely used for shingles, barrels, utensils, and 

 in construction. It is light brown, soft, easily worked, not very strong, with a 

 specific gravity of about 0.37. The tree is also called Big pine. Shade pine and 

 Great Sugar pine. 



4. MEXICAN WHITE PINE — Pinus strobiformis Engelmann 



This tree inhabits canons and mountain sides in Arizona, New Mexico and 

 Chihuahua, reaching a height of about 30 meters, with a trunk 6 dm. in thickness. 

 Its branches are slender and somewhat drooping. 



The bark is thick, deeply fissured, brown to 

 reddish brown. The young twigs are somewhat 

 reddish hairy, becoming smooth, and sometimes 

 covered with a bloom. The leaves are in clusters of 

 5, slender, but rather stiff, hght green, very minutely 

 toothed, 10 cm. long or less; their sheaths become 

 2 to 2.5 cm. long, and fall away early. The tree 

 flowers in May or June; the oblong staminate flowers 

 are 8 or 10 mm. long; the pistillate flowers are ter- 

 minal, usually two or more together. The cones 

 ripen during the summer of the second year, when 

 they are oblong, pendulous, 1.2 to 2.3 dm. long, about 

 4 cm. thick; their scales are thin, about 3 cm. long, 

 with blunt reflexed tips devoid of any spine or 

 prickle; the seeds are oval, a httle flattened, i to 1.5 

 cm. long, the thin blunt wing only about 3 mm. long. 



The wood is hard, strong, reddish white, with a 

 specific gravity of about 0.49, and furnishes a valu- 

 able timber, 'as yet httle used. It is also called 

 Arizona White pine. 



Fig. 5. — Mexican White 

 Pine. 



5. ROCKY MOUNTAIN WHITE PINE - Pinus flexilis James 



This Rocky Mountain tree is also known as Bull pine, Limber pine, White 

 pine, and Rocky Mountain pine; it occurs at alritudes of from 1500 to 3600 

 meters from Alberta southward to western Texas and southeastern California, 

 varying greatly in size, and in the shape and size of the cones. Its maximum height 

 is 15 meters, with a trunk diameter up to 1.5 m. The tree of the south, having 

 very long, more slender cones and sonietimes minutely toothed leaves, is the Pinus 

 flexilis megalocarpa of Sudworth. 



The trunk is stout; its branches are stout, persisting and spreading, forming 



