OF ORNAMENTAL TREES. 185 



rise to the idea that it is also a native of the 

 United States. 



9. P. GRAXDIDENTATA, Michaiix. Leaves 

 downy when young, afterwards smooth on 

 both surfaces. Sinuately toothed, with large 

 unequal teeth. Large American aspen. Na 

 tive of the Northern States. 



A very fine tree when in a rather moist 

 situation, and unsurrounded by other trees. 

 It is not too troublesome by suckering, as 

 some of the others are. The best specimen 

 at Bartram is sixty -two feet high, and three 

 feet two inches in circumference. 



10. P. TREMULOIDES, Michaux. Leaves 

 roundish, heart-shaped, shortly pointed, slight 

 ly toothed. Bracts deeply 3-4-lobed, lobes 

 linear. American aspen. 



This, in moist, somewhat shaded situations 

 and not too much crowded, is an ornamental 

 round-headed tree, and though not so pretty 

 as the European, has its leaves shaken, like 

 it, by every playful breeze. 



PRUXUS, Tournefort.Nat. Ord. Drupaceae. 

 Icosandria, Monogynia, Linn. JSTut ovate or 

 16* 



