PINACE.E 



51 



CONSPECTUS OF THE NORTH AMERICAN SPECIES. 



Winter-buds subglobose, with closely imbricated scales. 



Leaves flat and grooved above, with stomata on the lower surface (in Nos. 3 and 5, also 

 on the upper surface), rounded and often notched, or on fertile branches frequently 

 acute at apex. 



Leaves on sterile branches spreading, not crowded. 

 Cones purple. 

 Leaves dark green and lustrous above, pale below. 



Bracts of the cone-scales much longer than their scales, reflexed. 



1. A. Fraseri (A). 



Bracts of the cone-scales shorter or rarely slightly longer than their scales. 



2. A. balsamifera (A). 



Leaves pale blue-green, stomatose above. 3. A. lasiocarpa (B, F, G). 



Cones green (green, yellow, and purple in No. 5). 



Leaves dark green and lustrous above, pale below. 4. A. grandis (B, G). 



Leaves pale blue or glaucous, often stomatose above on the upper surface. 



5. A. concolor (F, G, H). 



Leaves on sterile branches pointing forward, densely crowded, dark green and lus- 

 trous above, pale below. 6. A. amabilis (B, G). 

 Leaves often 4-sided, with stomata on all surfaces, blue-green, usually glaucous, 

 bluntly pointed or acute, incurved and crowded on fertile branches; cones purple. 

 Leaves of sterile branches flattened and distinctly grooved above; bracts of the 

 cone-scales rounded and fimbriate above, long-pointed, incurved, light green, 

 much longer than and covering their scales. 7. A. nobilis (G). 

 Leaves of sterile branches 4-sided; bracts of the cone-scales acute or acuminate 

 or rounded above, with slender tips shorter or longer than their scales. 



8. A. magnifica (G). 



Winter-buds acuminate, with loosely imbricated scales; bracts of the cone-scales pro- 

 duced into elongated ridged flat tips many times longer than the obtusely pointed 

 scales ; leaves acuminate, dark yellow-green above, white below, similar on sterile and 

 fertile branches. 9. A. venusta (G). 



i. Abies Fraseri Poir., Balsam Fir. She Balsam. 



Leaves obtusely short-pointed or occasionally slightly emarginate at apex, dark green 

 and lustrous on the upper surface, marked on the lower surface by wide bands of 8-12 



Fig. 52 



