MANUAL 



OP 



TH E BOTANY 



OF THE 



NORTHERN UNITED STATES, 



INCLUDING THE DISTRICT EAST OF THE MISSISSIPPI AND 

 NORTH OF NORTH CAROLINA AND TENNESSEE. 



BY ASA GRAY, 



LATE FISHER PROFESSOR OF NATURAL HISTORY IN HARVARD UNIVERSITY. 



Stxtfj 



REVISED AND EXTENDED WESTWARD TO THE 1 00th MERIDIAN. 



BY 



SERENO WATSON, 



CURATOR OF THE GRAY HERBARIUM, HARVARD UNIVERSITY, 

 AND 



JOHN M. COULTER, 



PROFESSOR OF BOTANY IN WABASH COLLEGE, 



ASSISTED BY SPECIALISTS IN CERTAIN GROUPS. 

 WITH TWENTY-FIVE PLATES, 



ILLUSTRATING THE SEDGES, GRASSES, FERNS, ETC. 



NEW YORK : CINCINNATI : CHICAGO 



AMERICAN BOOK COMPANY 



