CONE-BEARERS. 25 



tuberance dorsal (i. e., on the back) mostly termi- 

 nated by a conspicuous prickle or spine; leaves various", 

 usually long, in fascicles of 2, 3, or 5, their sheaths 

 mostly persistent for several years. Wood usually 

 darker, harder, more resinous than the White Pines. 



A large number of species, 19 in western America. 



Divided by position of cones into Two Sections: 



Sec One.-TERMINALES 



SUB-TERMINAL-CONED PINES. 



Cones arising among the leaves near the end of 

 the bearing shoots, or just below the bud, usually 

 falling soon after ripening, rarely remaining persistent 

 for several years. Male flowers forming a rosette of 

 many long, brown catkins at the end of bnmchlets 

 with the leaf-bud or a few leaves in the center the 

 position of the flowers corresponding to that of the 

 cones. 



Three Sub-Sections: 



Sub-SCO. I m Brachyphylfa. 



SHORT-LEAVED PINES. 



Leaves very short, 1 to 2 inches long, their sheaths 

 soon falling away in the two first groups. 

 Three Groups: 



