48 KEY TO GENERA AND SPECIES 



dark shining green. Occasionally cult. Na- 

 tive in western Asia. Oriental Spruce, Picea 

 orlentalis Carr. 



Fig. 80. Black Spruce. 

 Showing, leaf arrange- 

 ment, hairy branchlet 

 and leaf section. 



Fig. 81. Colorado 

 Blue Spruce. 



89. Foliage bluish green or silvery 90. 



89. Foliage green. Cones 4 to 7 inches long. Cult, 

 and escaped. Native in Europe. (Fig. 77.) 

 Norway Spruce, Picea Abies (L.) Karst. 



90. Cones i\ to 4 inches long; scales distinctly 

 longer than broad, with a ragged blunt apex. 

 Cult. Native in' the Rocky Mountains. 

 (Fig. 81.) Colorado Blue Spruce, Silver 

 Spruce, Picea Menziesii Engelm. 



