iv THE CAYUGA FLORA. 



cal friends for pronouncing upon varying or critical forms. Dr. Gray, 

 in the midst of most arduous labors, kindly went over a large pack- 

 age of specimens sent him, contributing valuable notes and suggest- 

 ions, especially on Ranunculacccr and Composites, Moreover he 

 most thoughtfully and opportunely forwarded for use, the proof-sheets 

 of his " Revision of the North American Ranunculi." Mr. Sereno 

 Watson, of Cambridge, assisted me on the Rosacea and Apetalce. 

 Our Carya sulcata was submitted with many other woody plants to 

 Professor C. S. Sargent. Dr. Vasey of the National Herbarium has 

 seen a large number of our grasses and given me much information 

 on forms collected here and elsewhere. He examined a large number 

 of Eatonias in the herbariums of the eastern cities before naming the 

 herein-described species of that genus which had leng interested me. 

 To the herbarium of Mr. M. S. Bebb, of Rock ford, 111., has been con- 

 tributed at different times, full sets of our interesting Salices. In re- 

 turn he has contributed very valuable notes, drawings and specimens, 

 and our correspondence has been a most delightful one. In spite of 

 ill-health he has freely advised me ; and defining the position of the 

 hybrid willows is chiefly his work, any opinion of my own having in 

 most cases, received his sanction. Mr. Moroug, of Ashland, Mass., 

 has equally favored me in his especial field the Naiadacece. His con- 

 tribution of specimens to my own herbarium has been of very great 

 value. Valuable information or specimens have also been received 

 from Dr. Charles H. Peck of the N. Y. State Herbarium, from Mr. E. 

 L- Hankenson, of Wayne Co., and from Professors Trelease, J. M. 

 Coulter, and L. H. Bailey. 



In making explorations and amassing the materials and facts for 

 the catalogue, the writer has of course devoted much of his own time 

 and resources, and has for certain periods privately employed the as- 

 sistance of special students ; but he here wishes to make a general 

 acknowledgement for information always freely reported, — when any- 

 thing interesting turned up, — by the special students in botany and 

 others, whose helpful and generous ways have often been the chief 

 encouragement in the pursuit of the work. 



The w T ork of exploration, collection, revision, critical study-, corres- 

 pondence and the accumulation of collateral facts, has all been car- 

 ried on as a secondary matter to unusually arduous duties of instruc- 

 tion. It is believed, however, that the work has been thorough enough 

 to justify publication, and the reader is assured that all localities 

 given in the catalogue are selected from records written where the 

 plants grew, or made at the end of the excursion on which they were 

 observed. A full, frank statement is made where necessary, of obser- 

 vations, of opinions held in regard to distribution, and of other mat- 

 ters, in order to furnish an unequivocal basis for emendations, cor- 

 rections and additions, — as well as to give information, — believing 

 that a mere list of names, not easily capable of verification, really 

 furthers our knowledge but little. It is to be hoped that this contri- 

 bution will be met in the spirit in which it is offered, its oversights 

 and manifest shortcomings pardoned in the endeavor to contribute 

 additional, authentic information, whenever such is obtained by those 



