PREFACE. 



will always repay the botanist, while the Pocono Plateau is especially 

 interesting on account of the many northern plants found there. 



Hearty thanks are due the different botanists who have helped by 

 their contributions to make this catalogue as complete as possible, and 

 whose names occur so frequently in the following pages. I am also 

 indebted to the liberal management of Wyoming Seminary, whose finan- 

 cial aid made the publication of this flora possible. Personally I am 

 especially indebted to Prof. W. R. Dudley, of Leland Stanford, Jr., Uni- 

 versity, whose advice and assistance have been such that all merit that the 

 flora may have rightfully belongs to him. 



C. O. THURSTON, 



Wyoming Seminary. 



