INTRODUCTION. 



Knob of Pocono 3 miles W. of Tannersville, 2225' 



High Knob, in Pike Co 2010' 



Ararat Peak, Wayne Co 2600' 



Sugar Loaf, Wayne Co 2450' 



Elk Mountain, Susq. Co., South Knob . . 2575' 

 North Knob 2700' 



In closing I cannot refrain from expressing my cordial appreciation of 

 the work of Professor Thurston, who has written so much of this Flora. 

 To him will no doubt be largely left the subsequent accumulation of 

 facts and the final revision of this publication. Every aid possible from 

 the botanists of Pennsylvania, who have so kindly aided me, I solicit 

 in his behalf. 



WILLIAM RUSSEL DUDLEY, 



Ithaca, N. Y. 



SUMMARY. 



Native species, 858 



Introduced species, 115 



Varieties, 31 



Total, 



1004 



