158 ipostclsia 



much smaller. It begins to flower and to bear 

 fruit when it is only a few centimeters high. The 

 ripe cones usually persist in an unopened con- 

 dition and are frequently seen attached to the 

 older branches and even to the trunks of the 

 trees. The bark of the older trunks is thick, 

 rough and furrowed both vertically and hori- 

 zontally. 



The variety Murray ana, the lodge-pole pine 

 of the interior, is a straight, slender, narrowly 

 conical, thin-barked tree, often 30 meters high, 

 with leaves wider than those of the type. In- 

 tcrgrading forms connect these extremes. 



Section 2. Strobiis. Spach. Hist. Nat. Veg. 

 Phaner. 11:394.1842. emended. 



Apophysis of the cone-scale not pyramidal, 

 furnished with a terminal umbo. Foliage leaves 

 in fascicles of five, with a usually deciduous 

 sheath of scales. 



Cones 12-25 centimeters long, cylindrical, 

 ends of the scales little thickened, wing of 

 seed longer than the seed. Piniis monticola 



Cones 4-8 centimeters long, their scales much 



