Flora of the . Ulegany Slate Park Region 183 



with steepness of slope, which facilitates soil erosion after 

 fire, have all contributed to the present character of the 

 vegetation, a thin second-growth of trees and shrubs pre- 

 ferring sterile slopes. Hemlock is abundant only at the 

 base of the mountain. From the north summit there is 

 obtained a good view up the valley of Wolf run (figure 

 29). The slope on the west side toward the Allegheny 

 river is particularly abrupt in many places. In the brook 

 (Wolf run) at the base of the mountain is found a fine 

 growth of Callitrielie heterophylla, with Ludvigia palustris 

 and / 'iola cucullata. Several butternut trees flourish here 

 and the Sundrops, Oenothera perennis, is very abundant. 

 There are few moist places on the slopes of the moun- 

 tain except along the slope above Wolf run on the north 

 side. The undergrowth on the mountainside contains 

 some of the finest examples of the Black Snakeroot, 

 Cimicifuga racemosa, to be found anywhere in this region. 

 The Yellow Poplar, Liriodendron tulipifera, is also abun- 

 dant here, but of course chiefly as saplings or young trees. 

 The principal trees and shrubs of the slopes are given in 

 about the order of their relative abundance although from 

 place to place considerable variation may be found in this 

 respect, while the principal herbaceous species are listed in 

 systematic sequence, the most abundant ones in heavy 

 type. 



Trees {mostly young") 



Tsuga canadensis Fagus grandi folia 



Acer saccharum Populus grandidentata 



Quercus rubra Prunus serotina 



Tilia americana Liriodendron Tulipifera 



Fraxinus americana Betula lutea 



Quercus alba Amelanchier canadensis 



Betula lenta Populus tremuloides 



