2$6 MUHLENBERG^ OBSERVATIONS ON THE 



tapering. Wangenheim has given a figure of 

 it.* 



What I take to be a variety of this, with leaves 

 deeper indented, smaller, and not shed before 

 spring, grows upon the mountains. 



D. Black Oaks. So I call those that have a 

 blackish bark, by which they may be distinguished 

 at a distance. To this division I refer. 



11. £{uercus rubra Wangenh, p. 14. Fig. 7. 

 and Du Roi PI. 5. Fig. 2. is certainly distinct 

 from Quercus rubra maxima, by its bark and fruit. 

 Leaf-stalks very smooth, long 5 leaves also smooth 

 on both surfaces, except within the angles of the 

 nerves. Is universally known here by the name of 

 the black oak. 



12. Quercus nigra Wangenheim, Marshall, 

 Du Roi. This varies very much in its leaves 3 

 and sometimes can scarcely be distinguished from 

 the foregoing, whence it is generally considered 

 here as a variety of it. Whether it really be 



* This should be separated from the red oaks. Its specific character is, 

 {Querent coccinea: l'oliis oblongis profunde sinuatis glabris, lobis distan- 



tibus divaricatisapice dentatis acutissetacco-mucronatis,calycibusfru'ctu» 



basi attcnuatis. 



