6 ROCHESTER ACADEMY OF SCIENCE. [Oct. 8, 



A CKNOWLEDGEMENTS. 



The thanks of the compilers are also due to Mr. and Mrs. Wil- 

 liam Streeter, Mr. A. M. Dumond, Mr. C. C. Laney, Mr. John 

 Walton, Mr. John Dunbar, Mr. W. W. Parce, Mrs. J. H. Mc- 

 Guire, Mrs. Geo. C. King, Miss Emma E. Iles, Mrs. E. L. Maguire, 

 and Miss Josephine Hoffman, members of the Botanical Section ; 

 their untiring zeal has added the names of many plants to the list. 

 To Mr. Baxter and Mr. Walton we owe the description of Mendon 

 Ponds ; to Professor Lennon the description of the ravine at Holley 

 and the swamp at Bergen ; and to Mr. Baxter the description of the 

 swamp at Adams Basin. 



To Professor W. W. Rowlee, of Cornell University, we are 

 especially grateful for his review of the entire proof of the plant list, 

 and for his examination of large numbers of doubtful specimens, 

 particularly the Cyperacecz, with the assistance of Mr. K. McK. 

 Wiegand upon the Carices. 



The assistance of Mr. J. B. Fuller in preparing this list, and 

 in making the comparisons between the floras, has been invaluable. 

 Without his pains-taking care and untiring labor the list would have 

 been far less complete and accurate. 



To the President of the Academy, Professor H. L. Fairchild, 

 the Committee are indebted not only for the chapter upon the phys- 

 ical characters of the region, but for the help and encouragement 

 which alone have made possible the publication of this list. 



Localities of Special Interest ; The Lesser Floras. 



The flora of the territory, as a whole, is not greatly varied, 

 although there are localities of special interest. Among these are 

 the shores of Lake Ontario and Irondequoit bay, the banks of the 

 Genesee river, the Mendon ponds, the swamp at Adams Basin, the 

 large swamp in Genesee county commonly called Bergen swamp, and 

 the ravine at Holley, brief descriptions of which follow. 



SHORE OF LAKE ONTARIO. 



The shore of Lake Ontario is usually steep bluffs of "boulder 

 clay." In some places the Medina sandstone is exposed, while in many 

 places the new beach has cut off bays which are filling as marshes. 



The shore of the lake has been very thoroughly explored by Dr. 

 S. B. Bradley, Dr. C. M. Booth, Dr. Anna M. Searing, Mr. J. B. Fuller, 

 and Mr. George T. Fish. 



