CONE-BEARERS. 19 



Class A.-PERSISTENTES. 



EVERGREEN FASCICULARS. 



Trees with leaves persisting for several years ; cones 

 requiring at least two seasons to complete their 

 growth. Two Genera PINUS and CEDRUS True 

 Pines and Cedars. 



First Genus, 



THE TRUE PINES. 



Very useful trees with leaves in fascicles of 2 to 5 

 each (one species single-leafed), sheathed at base, 

 with scaly wrappings. Fruit, a cone or burr of di- 

 verse forms conical, cylindrical, and globose and 

 requiring two years to mature (two species require 

 three years). Cone scales with protuberances usually 

 tipped with spines or prickles. Male flowers numer- 

 ous, cylindrical, \ to 4 inches long, usually, forming 

 a rosette at or near the end of branch lets. Seventy- 

 seven known species, twenty -five in Northwest Amer- 

 ica. (Only the twenty-five American species will be 

 described in this Hand-book.) 



Separated chiefly by characters of the wood into 

 Two Sub-Genera: 



