l8 ROCHESTER ACADEMY OF SCIENCE. [Oct. 8, 



and is properly included in our district. The Buffalo list also includes 

 the plants of Portage, on the middle valley of the Genesee river, 

 forty-five miles from Buffalo, in an air-line, and sixty-three miles by 

 the Erie railway. 



As the area included in the Buffalo list overlaps the proper terri- 

 tory of our Monroe flora, a just comparison cannot be drawn without 

 making some explanations and eliminating some species. 



The total number of species enumerated in the Buffalo list is 

 1289. Of these not less than 46 are credited to the Bergen swamp 

 only, or to other localities within our Monroe flora territory. To 

 make a proper comparison, all the species should be excluded from 

 the Buffalo list which are credited simply to the far-removed locali- 

 ties, like Bergen and Portage. 



The "Cayuga Flora" was published in 1886 by Professor W. R. 

 Dudley, of the Botanical Department of Cornell University. The 

 territory of this list has natural geographic boundaries, and is nom- 

 inally the hydrographic basin or drainage area of Cayuga lake. It 

 covers an area of nearly 1 200 square miles, and includes a considerable 

 variety of topography and range of altitude, as well as deep east-west 

 ravines and other features affecting the flora. The temptation to 

 include the peculiar flora of the West Junius ponds, which are out- 

 side of the limits of the Cayuga basin, was so strong that Professor 

 Dudley yielded in so far as to include it with explanation. He also 

 notes species and varieties in the Seneca lake basin, but with con- 

 scientious and scientific spirit he does not give them standing by 

 numbering them in the list. 



The total number of species and varieties in the Cayuga flora is 

 1278. 



The region covered by the Monroe county list has but little 

 topographic variety or other physical features to modify the flora and 

 multiply species. The large total number, 1309, is due to the thor- 

 ough explorations of so many collectors, extending over many years. 

 Species are not included concerning which there are any serious 

 doubts. The list would have been materially lengthened had we in- 

 cluded all the species fairly reported, and all "escapes" which have 

 been seen growing spontaneously. In these respects great care has 

 been exercised, and the error has been rather in excluding species 

 which might be entitled to recognition. 



In the following lists will be found the comparison of the three 

 floras, the territory of the Buffalo list lying contiguous upon the west 



