301 



nearby prairies and forest, as PotentiUa fniticosa and small plants of 

 Querais velutina. Solidago rigida and S. nem oralis occur, but not in 

 sufficient numbers to produce the usual color-dominance. Other 

 prairie plants occur, but very little sod is being formed. Quercns 

 velutina seedlings develop readily. 



List of the Species of the Sporoholiis hcterolepis-Sorghastrum 

 nutans Consocies of the Bunch-grass Association 



(Of the typical portion only) 



Dominant Species 



Sporobohis heterolepis 

 Sorghastrmn nutans 



Secondary Species 

 Panicuni virgatuui 

 Solidago rigida 

 Solidago neui oralis 

 Spartina uiichauxiana 

 Koeleria cristata 



Relic Species 

 Sporobohis cryptandrus 



Invading Species 

 Quercns velutina 

 Liatris scariosa 

 PotentiUa fruticosa 



Andropogon scoparius 

 Andropogon furcatns 



Aster ptaruiicoides 

 Polygonufu tenue 

 Amorpha canescens 

 Buphorhia corollata 

 Solidago speciosa angustata 



Lobelia spicata 

 PotentiUa argnta 

 Coniandra uuibellata 



THE LIATRIS SCARIOSA ASSOCIATION 



Following the Artemisia-Panicnm association or either ot the con- 

 socies of the bunch-grass association, is another association of xer- 

 ophytic plants, the Liatris scariosa association. 



Location. — This association is found particularly upon the sand 

 ridges farther inland than the fringing dune. It is best developed to- 

 ward the southern part of the region, where it dominates the ridges 

 of nearly pure sand. Toward the northern parts of the region the 

 black oak has obtained dominance on the sand ridges, although the 

 Liatris scariosa association may remain coexistent with it, but occu- 

 pying the open spaces between the trees. 



Physical Characteristics. — The soil occupied by this association 

 is essentially sand to which a little humus has been added, though not 



