ECONOMIC WOODS OF THE UNITED STATES 93 



Lustre not so high as in preceding. Taste of wo_o d 

 "leguminous." Rays variable from minute to 

 medmm, irregular, rather conspicuous. Black 

 Locust. Robinia pseudacada L. (C, A) (Plate III, 

 Fig. 3).'" 



b^ Color orange yellow to Yellowish brown , becoming n i.s- 

 set brown upon exposure ; thin sapwood nearly white. 

 Wood modera.telv hea.vv. hard, and strong. Texture 

 coarse. Pores in early wood often in rather wide 

 zone. Pores in late wood minute, in groups of 3-6; 

 not joined by wood parenchyma. Tyloses present, 

 fairly abundant. Rays very prominent on radial 

 section, often high; heterogeneous. Odorless and 

 tasteless. Red Mulberry. Morus rubra L. (C, S) 

 (Plate V, Fig. 1). 



c^ Color light cherry red to reddish brow n; thin to 

 moderately thick sapwood greenish. Wood heavy, 

 hard, and strong. Text ure very coarse. Pores in 

 early wood in broad zone. Tyloses absent or rare. 

 Gummy substance in vessels. Odorless and tasteless. 

 Rays mostly homogeneous. 



a^ Ra ys distinct, but not co nspifirms; fairly uni- 

 'tona; ray cells very small, uniform. Pores in 

 outer portion of late wood small to minute, usually 

 in groups of 5-20; rarely Joined by wood paren- 

 chyma into bands; individual pores visible under 

 lens. Kentucky Coffee Tree. Gymnocladus 

 dioicus Koch (C) (Plate III, Fig. 5). 



b' Ra vs conspicuous : variable; ray cells com- 

 paratively large, variable. Pores in outer portion 

 of late wood minute; usually in groups of 10-25; 

 often joined by wood parenchyma into short, 

 wavy (sometimes continuous) tangential bands; 

 individual pores mostly invisible under lens. 

 Honey Locust. Gleditsia triacanthos L. (C, S) 

 (Plate III, Fig. 6). 



4 Pores in latp ywnnr\ janlfl.t,pf|^ nr fairly evenly distributed; not 

 in groups or lin es; comparatively large, often approaching 

 m size those of early wood. Pores in early wood moderately 



