10- 



t- 



< 6 - 













d 

 « 



\ 



















• 

 * 

 • 

 * 

 « 

 • 

 * 

 * 

 • 

 * 



* 













HEAT VAL 







i 



k 



/ 



{ 













\ 







CRUDE F 



AT 











i 





























































June 



July 



August i September 



-9,400 



-8,600 



-8,200 < 

 > 



Figure 1. — The relationship between crude fat and heat of combustion of snowbrush. (Adapted from 



Richards.) 



-J 8,400 - 



'/A 



W SP SU F 

 B ilterbrush 



Btu./lb. i I 



Crude fat Y///i 



Winter W 



Spring SP 



Summer SU 



Foil F 



77. 



'MIA 



W SP SU F 

 Mt Mahogony 



8 3 



'/A 



- 14 



- 12 9 



- 10 3 



8 ^ 



« 5 



Li- 



4 UJ 



Q 



- 2 



2^ Lo 



(J 



W SP SU F 

 Soge bf us h 



Figure 2. — Data from Dietz, Udall, and Yeager showing crude fat and heat content of three Colorado brush 



species. 



3 



