2 BULLETIN 154, U. S. DEPAETMEXT OF AGEICULTUEE. 



an altitude as low as 1,800 feet, and occurs as a temporary type fol- 

 lowing fire with little regard to elevation. 



Fig. 1. — Botanical distribution of lodgepole pine. 

 SIZE, AGE, AND HABIT. 



Lodgepole is one of the smallest of the commercially important 

 pines. In well-developed stands approximately 140 years old, at 

 which age the tree may be considered mature, most of the merchant- 



