280 OHIO BIOLOGICAL SURVEY 



It bears a general resemblance to the pine barrens common everywhere 



below the border of the glacial moraines. Its principal component 

 species are : 



PiNus RiGiDA Gaultheria procumhens 



Finns virginiana Panicum diclwtomum 



Quercus velutina Cliimapliila macidata 



Castanea dentata Meibomia rotundifolia 



Oxydendrum arioreum Isotria verticillata 



Vaccinium vacilans Solidago nemorom 



Gaylosaccia haccata Houstonia longifoUa 



PolycoUum staminium Eieracium venosum 



Kalmia latifoUa Panicum sphaerocarpon 



Epigaea repens Cunilla originoides 



Smilax rotundifolia Lespedesa hirta 



Smilax glauca ' Lespereza repens 



Amalancier canadensis Lespedeza procum'bens 

 Bosa virginiana 



Together with these are numerous seedlings from other associa- 

 tions. Saplings of Hicoria ovata are nearly always present and here, 



as everywhere else, Acer ruhriim comes up abundantly but attains no 

 great size. 



The Oak Forest. The pine forest occurs throughout the region on 

 the more exposed ridges. Where the ridges become wider and the con- 

 ditions are less severe, the pines gradually give way to the hard woods 

 and a mixed oak forest is developed in which Quercus prinus is some- 

 times the dominant tree and occasionally occupies the ground almost 

 to the exclusion of other arborescent species. With it are more us^^ally 

 present, however: 



Quercus alba Hicoria minima 



Quercus velutina Hicoria ovata 



Oxydendrum arhoreum (fig. 18) Nyssa sylvatica 



Castanea dentata Acer rubrum 



In the underbrush the heaths give way to the grapevine (Vitis 



bicolor), which is quite as typical a representative of the association 

 .as the oaks. With it are: 



Cynoxylon (Cornus) florida (an Smilax glauca 



under tree.) Sosa virginiana 



Bmilax rotundifolia Viburnum acerifolium 



The most characteristic plants of the herbage are: 



Meibomia nudifora Linum virginianum 



Meiboma rotundifolia Monotropa unifora 



Basy stoma laevigata Hypopytis americana 



Titythymalopsis (Euphorbia) corollata 



