CONTENTS. 



Page 



Introduction ... 177 



History 177 



Physiography .... . . . . 182 



Catalogue of Flowering Plants and Ferns . .... 193 



Appendix .... 353 



Fugitive Species . 353 



Excluded Species . 354 



Doubtful Species 356 



Tabular List of Families 357 



Observations on Soil Relations 361 



List of New Forms and Combinations 363 



Index 365 



Introduction. 



HiSTOEY. 



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 beginning 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 the college at that time, Chester Dewey and 

 Amos Eaton. 



Chester Dewey was a native of Berkshire County, born at Sheffield 

 in 1784. He was graduated from Williams College in 1806, accepted 

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

 fessor of Mathematics and Natural Philosophy in the same institution. 

 He held this office for seventeen years. From 1827 to 1836 he was 



