1*6 JOURNAL OF THE ARNOLD ARBORETUM [vol. v 



ANACARDIACEAE 

 Rhus canadensis Marsh. The Aromatic Sumac is found in thickets and 



n rocky ground froc 

 Rhus trilobata Nutt. 



grows 



thickets and on rocky ledges. It is most abundant on the tableland at 

 the mountain top. 



Rhus Toxicodendron L. The Poison Ivy is a common shrub or climber 

 in thickets and open woods at all levels. There are evidently two, and 

 perhaps three, forms or varieties, which have not been distinguished, 

 growing here. There is marked variation in the size, lobing and pubescens 

 of the leaves, in the upright or scandent habit, and in the time of flowering. 



Rhus glabra L. The Smooth Sumac is found in thickets both in the 

 valley and at the top of the mountains. 



Rhus copallina L. This species grows in similar situations to the last, 

 and is more common. 



AQUIFOLIACEAE 



Ilex opaca Ait. The evergreen Holly is found only in the valley, where 

 it grows in sandy bogs or along the creek banks. 



Ilex caroliniana (Walt.) Trel. This southern species grows abundantly 

 along the rocky ravines on the north slopes of Rich Mountain. It is also 

 common, but of small size, in thickets at the top of the mountain. 



Ilex decidua Walt. This deciduous species is common in thickets and 

 woods, especially in the valley, but is also found in the mountain top. 

 It sometimes becomes a small tree 5 or 6 meters tall. 



CELASTRACEAE 



Evovymus americanus L. This pretty little shrub is found occasionally 

 in sandy bogs and on moist banks at the lower levels. 



Evonymus atropurpureus Jacq. The Wahoo grows in thickets and 

 open woods, being most abundant in the valley, but sometimes found at 

 the mountain top. 



STAPHYLACEAE 



Staphylea trijolia I,. The Staff-tree is common in the rich coves and 

 on fertile slopes on the north side of the mountain. 



ACERACEAE 



Acer saccharum Marsh. The typical Sugar Maple is found occasionally 

 in woods in the valley. 



Acer saccharum var. glaucum Surg. This is the common Sugar Maple 

 of the Ozark region, and it grows abundantly and of large size, here in 

 the valley and on the north slopes of the mountain. 



Acer saccharinum L. The Silver Maple is rather rare, and found only 

 along the margins of Big Cieek. 



