Table A. — data sources 



Species 



National Forest 



: Coconino 



Tonto 



Lincoln : Santa Fe : Carson 



Blackjack pine^ {Pinus ponderosa 

 Laws . ) 



Yellow pine^ {Pinus ponderosa 

 Laws . ) 



Douglas-fir {Pseudotsuga menziesii 

 var. gtauaa [Mirb.] Franco) 



White fir {Abies aoncolor [Gord. 

 and Glend. ] ) 



Southwestern white pine {Pinus 

 flexilis var. reflexa Engelm.) 



Engelmann spruce {Picea 

 engflmannii Parry) 



Aspen {Populus tremuloides Michx, ) 



Corkbark fir {Abies lasiocarpa 

 var. arizonica [Merriam] Lemm.) 



In the Southwest, blackjack and yellow pines are distinguished by their 



bark colors; blackjack pines have very dark bark and yellow pines heavily 

 plated, orange bark. This distinction is based on age, growth, and vigor 

 differences rather than botanical differences, but foresters have found it 

 useful in forest management planning. 



PUBLICATION CITED 



Hann, David W. , and B. Bruce Bare. 



1978. Comprehensive tree volume equations for major species of New riexico 

 and Arizona: I. Results and methodology. USDA For. Serv. Res. Pap. INT-209, 

 43 p. Intermt. For. and Range Exp. Stn., Ogden, Utah. 



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