KEY TO GENERA AND SPECIES 



i. Leaves very small and scale-like, closely ap- 

 pressed and overlapping; less than | of an 

 inch long. (See Figs. 5, 7.) 7. 



1. Leaves more than | of an inch long, not closely 



overlapping. (See Figs. 90, 192.) 2. 



2. Leaves awl-shaped (i. e., narrow and tapering 



from the base to a rather sharp apex); ^ to 

 f of an inch long and r^ to f of an inch wide. 

 (See Figs, i, 20.) Fruit a blue berry-like 

 cone 4. 



2. Leaves not awl-shaped 3. 



3. Leaves needle-shaped (i. e., slender, about the 



same thickness throughout, and in cross- 

 section either semi-circular, triangular, or 

 rhombic), not conspicuously flattened. (See 

 Figs. 63, 6405. 



3. Leaves flattened and distinctly narrowed at 



the point of attachment, with or without 

 a distinct leaf -stalk. (See Figs. 12, 184.) 9. 



4. Leaves three at a node, to f of an inch 



long and about ^ of an inch wide, all 



