For assistance in the vicinity of New Haven we wish to ac- 

 knowledge our indebtedness to Prof. O. I). Allen, F. N. Pease, 

 Esq., and Mr. J. A. Allen for many indispensable notes, especially 

 upon the Cyperacere and Cryptogamia ; to Mr. and Mrs. Oscar 

 Harger for much general aid, especially upon the grasses; and to 

 Dr. F. W. Hall of West Cornwall, who has added many interest- 

 ing species. Messrs. T. S. Brandegee, of Berlin, H. M. Denslow, 

 J. Sumner Smith and Robert Veitch, of New Haven, have also 

 made important additions. With Mr. George W. Hawes and Dr. 

 T. M. Prudden originated the idea of the present list, to which 

 they have contributed very many species. We wish also to express 

 thanks to our publishers, Messrs. Tuttle, Morehouse & Taylor, for 

 unusual care in their part of the work. 



As it is desired to maintain and increase its accuracy, we ask 

 that specimens of (uncultivated) plants not already in the list be 

 sent, with full particulars concerning habitat, date and circum- 

 stances of collection, etc., to Prof. 1). C. Eaton, New Haven, Ct., 

 in order that they may be preserved for future reference. 



A list of additions and corrections will be found at the end of 

 the catalogue. 



The Editors. 



March 30th, 1878. 



