PINACE^ 



403 



the open cone. Seed | in. long, with a wing 1-1 1 in. long and | in. 

 broad, shed as soon as ripe. 



This species is distinguished from all other five-leaved pines 

 with deciduous sheaths by the young shoots being minutely 

 glandular downy, and by the sharp-pointed, rigid, spirally 

 twisted leaves, the twist making a complete turn. 



Fig. 90.— pin us LAMBERTIANA. 

 a, shoot with leaf chistcrs ; h, cluster of five leaves ; c, winter bud ; d, apex of leaf ; c, section of leaf. 



Native of Oregon and California, occurring on mountains 

 from 2,000-9,000 ft. elevation. It is one of the most prominent 

 species of the timber belt of the Sierra Nevada, especially on its 

 western slope, where, in company with Pinus ponderosa and 

 Abies Lowiana, it forms an important element in the main 

 coniferous timber belt. It ranges south to the high mountains 



