ECONOMIC WOODS OF THE UNITED STATES 99 



Black Cherry. Prunus serotina Ehrh. (C, 

 N,S). 



b^ Color light brown tinged with red to decid- 

 edly reddish. Pores not crowded, fairly 

 evenly distributed; solitary or in radial 

 groups of 2-3. Rays with considerable red 

 color; homogeneous. Grain often curly, 

 "landscape," or "bird's-eye." Maple.*"* 



a^ Part of the rays comparatively large, 5-7 

 cells wide, broader than the pores; high, 

 conspicuous. Intermediate rays mostly 

 uniseriate. Pith flecks rare. Growth 

 rings very distinct. Wood very heavy, 

 hard, and strong. Sugar Maple. Acer 

 saccharum Marsh. (N, C); Black Maple. 

 nigrum Michx. (N, C). 



b^ With less variation in size of rays, the 

 large ones not as broad as the pores; low, 

 inconspicuous; few uniseriate rays. 

 Growth rings often indistinct. 



a' Color deep and rich. Pith flecks un- 

 common. Wood fairly heavy, hard 

 and strong. A. macrophyllum (P). 



b' Color pale. Pith flecks very common, 

 often abundant. Wood rather light, 

 soft, fairly strong. Red Maple. A. 

 rvhrum L. (N, C, S); Silver Maple. 

 saccharinwn L. (N, C, S). 



0^ Color creamy or yellowish white, without 

 reddish tinge. Pores very small and numer- 

 ous; often in radial groups of 2-6. Rays 

 without color; finer and more numerous 

 than in preceding. Wood light, soft, not 

 strong. Otherwise as in preceding. Box- 

 elder. A. negundo L. (N, C, S, R), negundo 

 californicum Sarg. (Ps). 



b^ Wood parenchyma in somewhat broken tan- 

 gential lines, scarcely visible with lens. 



