"The number of species in each of twenty most numerous genera 

 is as follows : 



Genera. 



Carex 



Aster 



Solidago 



Potamogeton 

 Polygonum.., 



Salix 



Juncus 



Viola 



Scirpus 



Habenaria .... 



Genera. 



Ranunculus 

 Panicum.... 



Poa 



Asclepias. .. 



Rumex 



Quercus 



Anemone... 

 Viburnum.. 

 Hypericum , 

 Veronica.. . 



Native 

 Species. 



10 



Wliole 

 Number 



of 

 Species. 



12 



11 



9 



