264 



OHIO BI0L0C4ICAL SURVEY 



In other places, pernianentl.y covered by the water coining from 

 several springs at the base of the hillside, the ground is Imi'e of trees 

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



Fig. 9. Lizard's Tail (Saururus) in tlie Bottoinlancl Swamp. 



developed. In the spring this association is dominated by Caltha 

 PALUSTRis and Spathema foetida with, as secondary species: 

 Seneeio aureus Cdrdamine rhomhoidnt 



Sannnriihis septentrionalis Ildiiujtcnhts sceleratus 



During the summer, 8auri-rus cernuus (fig. 9) dominates the 

 association, whih^ in tlie autumn its place is taken by Polygonum ari- 

 FOLiUM, with which are a large numl)er of species in greater or less 

 abundance, including the following: 



Chry^ospU-n'iuii\ americanuin Alisina stihcordatitm 



Carex ."p. Penthorurn sedoides 



Isiuirdid jKiJiislris Bidens connata 



Bidciis aristatd Bidens ceniiia 



T.obelin cardiiialis Lobelia sjiphijitica 



Lillium eanadense Solidago painla 



Phlox maculata Bleph(iri(/lottis laccra 



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. 



