264 



OHIO BIOLOGICAL SURVEY 



In other places, permanently covered by the water coming fi-om 

 several springs at the base of the liillside, the ground is bare of trees 

 and a very interesting association of shade-enduring swamp herbs has 



Fig. 9. Lizard's Tail (Saururus) in the Bottomland Swamp. 



developed. In the spring this association is dominated by Caltha 

 PALUSTRis and Spathema foetida with, as secondary species: 

 Senecio aureus - Cardaminc rhomhoidea 



Ranunculus septentrionalis Eanunenlus sceleratus 



During the summer, Saururus cernuus (fig. 9) dominates the 

 association, while in the autumn its place is taken by Polygonum ari- 

 POLiUM, with which are a large number of species in greater or less 

 abundance, including the following: 



Chry-osplenium americanum Alisma suhcordatum 



Carex sp. PentJiorum sedoides 



Isnardia palustris Bidens connata 



Bidens aristata Bidens cernva 



7 ohelia cardinalis Lohelia syphilitica 



Lillium canadense Solidago pntnla 



Phlox maculata Blepharit/Jottis Uicera 



On one side this swamp is contiguous with a wooded hillside bear- 

 ing the usual forest of the coves. At the meeting place the two associa- 

 tions are sharply demarked by the character of the soil. There is no 

 sign of the encroachment of one association on the other and no tension 

 zone between them. 



