The Flora of the Cayuga Lake Basin 



467 



The genera containing ten or more species found in the basin are 21 in number. 

 They are listed below, first in order of number of species and then in order of 

 relationship. 



Carex 



Potamogeton 



Viola 



Panicum . . . . 

 Polygonum . . 

 Crataegus . . . 



Aster 



Salix 



Solidago 



Scirpus 



Juncus 





Species 



Species 



plus 





varieties 



111 



125 



23 



24 



21 



24 



19 



23 



19 



21 



19 



19 



18 



18 



17 



22 



17 



22 



17 



20 



17 



19 



Ranunculus. . 



Galium 



Prunus 



Rubus 



Habenaria. . . 



Poa... 



Veronica .... 



Bromus 



Ribes . 



Chenopodium 



Species 



15 

 14 

 12 

 12 

 12 

 11 

 10 

 10 

 10 

 10 



Species 



plus 

 varieties 



17 

 14 

 13 

 13 

 12 

 11 

 12 

 10 

 10 

 10 



The increase in the flora is due to several causes. The segregation of species and 

 varieties, which in the past thirty-nine years has been rather extensive in genera of 

 the northeastern United States — for example, in such genera as Glyceria, Panicum, 

 Carex, Crataegus, Galium, Antennaria, and Bidens — will account for about 54 per 

 cent of this increase. Weeds that have reached the basin and have become established 

 during this period add a rather large number of new species. Plants that have 

 escaped from cultivation within the region, have become established, and are now 

 behaving as weeds, are numerous. There is evidence that a few plants native to 

 the general region but probably absent from the flora in Dudley's time have since 

 that time migrated into the basin. Some native plants apparently overlooked by 



