CONTENTS. 



Introduction 



History ..... 



Physiography .... 



Catalogue of Flowering Plants and Ferns 

 Appendix . . . . . . 



Fugitive Species .... 



Excluded Species .... 



Doubtful Species .... 



Tabular List of Families 



Observations on Soil Relations 



List of New Forms and Combinations 

 Index 



Page 

 177 



177 

 182 

 193 

 353 

 353 

 354 

 356 

 357 

 361 

 363 

 365 



Introduction. 

 History. 



The first two decades of the 19th century constituted a period of 

 active study of North American plants, by both native and foreign 

 collectors and systematists. Pursh traveled in North America from 

 1799 to 1811 and published his Flora Americae Septentrionalis in 

 London in 1814. Michaux had already published the Flora Boreali- 

 Americana in Paris in 1803. Local students were beginniuij an inten- 

 sive study of the regions about the chief centers of scientific interest. 

 Dr. Jacob Bigelow's Florula Bostoniensis, the first local list published 

 in this country, appeared in 1814; Barton's Florae Philadelphicae 

 was published in 1818. Nuttall's Genera of North American Plants 

 appeared in the same year. 



During the second decade of the century Williams College was a 

 local center of botanical interest and activity. Two botanists of high 

 rank were connected with tiie college at that time, Chester Dewey and 

 Amos Eaton. 



(Chester Dewey was a native of lirrkshire County, born at Sheffield 

 in 1784. He was graduated from Williams College in 1800, accepted 

 a tutorship at the college in 1808, and in 1810 was appointed Pro- 

 fessor of Mathematics and Natural l*hilo-;opliy in the same institution. 

 He hchl this olhcc for scvcntt'cu \cars. I'Vom 1S_'7 to \S'M\ he was 



