versity, has collected several seasons in the Susquehanna valley in 

 Delaware county. Dr. Thomas F. Lucy has devoted much of his 

 time to the botany of the Chemung valley for the past thirty years. 

 Mr. James A. Crraves has botanized extensively in the lower Che- 

 mung valley, and for the past twenty years has made careful ob- 

 servations on the flora in the vicinity of Susquehanna borough, 

 his home. Prof, Frank E. Fenno in the past three years has been 

 indefatigable in investigating the botany of Barton, Apalachin 

 and intermediate points. Mr. W. C. Barbour has contributed 

 many notes on the plants of Sayre, Athens and Waverly, and Miss 

 S. A. Brown has favored us wnth a very complete list of plants 

 with notes from the vicinity of Unadilla Forks. The author's 

 knowledge of the flora was acquired during a ten years' residence 

 at Binghamton, in \vhich time the greater part of the region came 

 under his observation. 



We are fortunate also in having had the species of critical 

 groups passed upon by acknowledged authorities. Doubtful 

 carices have been named by Prof. T. C. Porter and Dr. Charles H. 

 Peck ; grasses difficult to identify have received attention from 

 Prof. F. Lamson Scribner and Mr. George V, Nash. The majority 

 of our willows w^ere identified for Dr. Millspaugh by the late M. S. 

 Bebb. Numerous single species of other groups have been named 

 by well-known botanists, who have been given credit in the list. 

 Specimens of a large number of the more critical species have 

 been deposited in the herbarium of Lafayette College, the herba- 

 rium of Columbia University, the herbarium of the Field Colum- 

 bian Museum, and the herbarium of the New York Botanical 

 Garden. Dr. Lucy has also presented to the Elmira Academy of 

 Sciences a nearly complete collection of the plants of our region. 



The author is especially indebted to Messrs. Coville, Mills- 

 paugh, Hoy, Lucy, Graves, Fenno, Barbour and Miss Brown for 

 not only furnishing copious notes, but also for reading the proof 

 of the entire list, thus authenticating every reference to their own 

 locality. Thanks are also due to Mr. O. S. Wadleigh for his care- 

 ful attention to the mechanical details of the volume while in press. 



WILLARI) X. CLUTF. 

 New Vf)rk, July i, 189S. 



