CONTENTS. 
Page 
Introduction 177 
History 177 
Physiography 182 
Catalogue of Flowering Plants and Ferns 193 
Appendix ............ .353 
Fugitive Species .......... 3.53 
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 
Intkoduction. 
History. 
The first two decades of the 19th century constituted a perio 1 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 180.3. Local students were beginning an inten- 
sive study of th(> regions about the chief centers of scientific interest. 
Dr. Jacob Bigelow's Florula Bostonien.sis, the first local list published 
in this country, appeared in 1814; Barton's Florae Philadelphicae 
was published in 1S18. Nuttall's Genera of North American Plants 
appeared in the same year. 
During the second decade of the century Williams Cojlrge was a 
local center of botanical interest and activity. Two botanists of high 
rank were connected with the college at that t imc, Chester Dewey and 
Amos Eaton. 
Chester Dewey was a native of Berkshire (^ouiity, born at Sheffield 
in 1784. He was graduated from Williams Collegia in ISOli, aceeptiMl 
a tutorshij) at the college in 1808, and iu ISIO was aj^poiuted Pro- 
fessor of Matheiiiatics and Natural Philosopliy in tiie same institution. 
He held tins ollice for seventeen vears. Fronx 1S27 to 1831) he was 
