MAN UAL 



OP 



THE BOTANY 



OP 



THE NORTHERN UNITED STATES, 



INCLUDING THE DISTRICT EAST OF THE MISSISSIPPI AND 

 NOKTH OF NORTH CAROLINA AND TENNESSEE, 



ARRANGED ACCORDING TO THE NATURAL SYSTEM. 



BY ASA GRAY, 



FISHER PROFESSOR OF NATURAL HISTORY IN HARVARD UNIVERSITY. 



Hfcftion. 



SECOND ISSUE. 



WITH TWENTY PLATES, 



ILLUSTRATING THE SEDGES, GRASSES, FERNS, ETC. 



NEW YORK: 



IVISON, PHINNEY, BLAEEMAN, & CO. 



CHICAGO : S. C. GRIGGS & CO. 



1868. 



