PREFACE. 



THE two seasons that have passed since the publication of the 

 Flora of the Upper Susquehanna have brought to our 

 knowledge a considerable number of species before un- 

 known to the region, as well as extended the range of many rare 

 ones. It having now become necessary to issue a second edition, 

 advantage has been taken of the opportunity to include these 

 additions and changes, thus placing the volume in accord with our 

 present knowledge. This material will be found in the following 

 pages arranged under two heads: (i) Species New to the Flora, 

 and (2) Additional Stations. 



The absence of earlier lists of plants made the first issue of 

 this book somewhat in the nature of a preliminary survey. It 

 was not expected that all the species had been included, nor do 

 we believe that those now added — which brings the total up to 

 1,201 species^ — completes the list. Enough have been discovered, 

 however, to show that our flora is as rich as any other in the State, 

 and to warrant further explorations of the whole field. The 

 author will be glad to receive further notes on the plants of our 

 region and will give such notes credit in future supplements. 

 Some of our observers are at present working on the mosses and 

 hepatics, and it is expected that the next Supplement will contain 

 lists of these with notes. 



All the species m the present list, about whose identity there 

 could be the slightest question, have been seen by the author and 

 in critical cases have also been submitted to acknowledged au- 

 thorities for verification. The specimens themselves are deposited 

 in the New York State Herbarium, the Herbarium of Lafayette 

 College, or the Herbarium of the Field Columbian Museum. 



I must again express my indebtedness to Messrs. Graves, 

 Fenno, Barbour and Lucy, for their continued cooperation m ex- 

 ploring this region. My thanks are also due to Miss Elsie 

 Murray, who has sent me an interesting list of species from the 

 vicinity of Athens, Pa., and to several others mentioned in the 

 text, who have kindly contributed notes on single species. 



WILLARD N. CLUTE. 



Binghamton, N. Y., Feb. 15, 1901. 



