62 



SILVA OF NORTH AMERICA. 



CONIFERiE, 



CONSPECTUS OF THE NOKTH AMERICAN SPECIES. 



MlCROPEirCB. 



Leaves flat, obtuse or emarginate at the apex, stomatif erous only on the lower surface ; 



^ 



cones ovate-oblong or oval. 

 Cones pedunculate- 



Cone-scales orbicular-oblong, about as wide as long, their bracts broad and truncate. 1. T. Canadensis. 

 Cone-scales oblong, much longer than wide, spreading at right angles after maturity, 



their bracts obtusely cuspidate , . 2. T, Caroliniana. 



Cones sessile. 



Cone-scales oblong, longer than broad, often abruptly contracted near the middle, 



, their bracts slightly cuspidate 3. T. heteeophyli«A. 



Hesperopeuce. 



Leaves convex or keeled above, bluntly pointed, stomatiferous on both surfaces. 

 Cones oblong-cylindrical. 



Cone-scales oblong-obovate, longer than broad, their bracts short cuspidate 



4. T. Meetensiana. 



