Key for Identification of Hardwoods 153 



U. S. Forest Service 

 FIG. 104. Yellow poplar. 



U. S. Forest Service 

 FIG. 105. Basswood. 



II. DIFFUSE-POROUS WOODS : PORES SCATTERED THROUGH 



BOTH SPRINGWOOD AND SUMMERWOOD. 



A. Pores varying in size from large to minute ; larg- 



est in springwood, sometimes giving thereby the 

 appearance of a ring-porous arrangement ; pith 

 rays too fine to be distinct without a lens. 



1. Wood rather heavy and hard; heartwood choco- 



late-brown BLACK WALNUT 



2. Wood light and soft; heartwood light reddish 



brown; without characteristic odor BUTTERNUT 



B. Pores all minute and indistinct ; most numerous 



in the springwood. 



i. Pith rays fine but distinct; wood hard, heavy, and 

 strong; annual rings clearly defined ; heartwood 

 reddish; sapwood narrow BLACK CHERRY 



