26 Proceedings of the Ohio State Academy of Science. 



cover of herbs. The ground is low and muddy but not dis- 

 tinctly wet. 



Principal species 

 Salix nigra S. alba 



Secondary species 



Trees : 

 Young Fraxinus americana Ulmus americana 



Juglans nigra 



Shrubs : 

 Rosa Carolina 

 Cornus stolonifera Rubus nigrobaccus 



Herbs, 7-8 feet tall: 

 Angelica atropurpurea 



Herbs, 



Teucrium canadense 

 Carex lurida 

 C. lupulina 

 C. tribuloides 

 Agrimonia parviflora 

 Geum canadense 

 Apios apios 

 Roripa palustre 

 Impatiens biflora 

 Rumex crispus 

 Iris versicolor 



2-2, feet tall : 



Asclepias syriaca 

 Juncus tenuis 

 Homalocenchrus oryzoides 

 Scirpus atrovirens 

 Lysimachia numularia 

 Equisetum arvense 

 Achillea millefolium 

 Dipsacus sylvestris 

 Verbena hastata 

 Festuca elatior 

 Phleum pratense 



These herbs lack the correlation of distinct societies but 

 Mentha spicata and M. piperita show well defined social unity 

 and may be regarded as herb societies ranking as subordinate 

 members in the forest zone. 



The original margin of the lake is outlined by a zone of 

 forest trees, 20 to 30 feet wide and which terminates abruptly 



