Key for Identification of Hardwoods 151 



U. S. Forest Service 

 FIG. ioo. Water hickory. 



U.S. Forest Service 

 FIG. 101. Black walnut. 



B. Pores of summerwood small, in concentric wavy 



lines. 



i. Wood moderately heavy; tough; heartwood 

 reddish brown or light brown ... . ELM 



C. Pores of summerwood arranged in wavy or branch- 



ing radial lines. 



1. Pith rays hardly visible; wood moderately light 



and straight-grained ; sapwood narrow; heart- 

 wood grayish brown .... CHESTNUT 



2. Pith rays conspicuous; wood hard and heavy 



OAK 



a. Pores in summerwood very small and 

 numerous; heartwood brown, without 

 reddish -tinge ; larger rays when seen in 

 radial section from \ inch to 4 inches in 

 height .... WHITE-OAK GROUP 



