90 STUDIES OF TKEES 



at first is dull green in color and later turns brown. The 

 husk does not separate into sections. The kernel is edible 

 and produces an oil of commercial value. 



The leaves are compound and alternate with 15 to 23 

 leaflets to each. 



Comparisons: The butternut (Juglans cinerea) is an- 

 other tree that has the pith divided into little chambers, 

 but the little chambers here are shorter than in the black 

 walnut, as may be seen from a comparison of Figs. 71 

 and 72. The bark of the butternut is light gray while that 

 of the black walnut is dark. The buds in the butternut 

 are longer than those of the black walnut and are light 

 brown instead of gray in color. The form of the tree is 

 low and spreading as compared with the black walnut. 

 The fruit in the butternut is elongated while that of the 

 black walnut is round. The leaves of the butternut have 

 fewer leaflets and these are lighter in color. 



GROUP X. TULIP TREE, SWEET GUM, LINDEN, MAG- 

 NOLIA, LOCUST, CATALPA, DOGWOOD, MUL- 

 BERRY AND OSAGE ORANGE 



TULIP TREE (Liriodendron tulipifera) 



Distinguishing characters: There are four characters 

 that stand out conspicuously in the tulip tree the bud, 

 the trunk, the persistent fruit cups and the wedged leaf. 



The bud, Fig. 74, about an inch long, is covered by two 

 purplish scales which lend special significance to its whole 

 appearance. The trunk is extremely individual because it 

 rises stout and shaft-like, away above the ground without 



