GENERA JUGLANS, FRAXINUS, &C. 257 



Quercus discolor Hort. Kew. remains still to be 



ascertained.* 



13. Quercus marilandica Gronov. Fl.Virg. 140. 



Q^ nigra pumila Marsh, is very well figured by 



Du Roi, PI. 6. fig. 2. and Wangenheim, PI. 5. 

 13. Leaves very much variable. Grows upon 



dry hills only.f 



E. Of willow-leaved oaks there are none in 

 this neighbourhood ; but about Philadelphia the 

 narrow-leaved Quercus phcllos grows in abun- 

 dance, and in the back countries another which 

 Marshall calls ®.phellos latifslia. The leaves 

 of the latter (probably a distinct species) ajc 

 oblong, veined, and woolly on the lower surface. 



F. Water Oaks. — Quercus aquatica Hort. Kew. 

 is not to be met with in this neighbourhood. 

 Sclerals uliginosa of "VYangenhtim I have seen in a 

 dry state, as also some others with leaves cottony 



* It is the true Quercus dieeolor Hort. Kew. to which I give the fol- 

 lowing specific character : 



&K discolor: foliis obovato oblongis sinuatis subtus pubescentibes, Lobk 

 oblongis obtusis dentatis setaceo-nuicronatis. 



f 1 take this to be Q^nigra L. which I distinguish thus : 



Q_tiigra: foliis cuneiformibus glabris basi subcoruatis subtrilobis, lobit 

 divaricatis intenncdio brevwre, dentihis setaceo-mucronatis. 



