MANUAL 



THE BOTANY 



THE NORTHERN UNITED STATES, 



INCLUDING THE DISTRICT EAST OF THE MISSISSIPPI AND 

 NORTH OF NORTH CAROLINA AND TENNESSEE, 



ARRANGED ACCORDING TO THE NATURAL SYSTEM. 



By ASA GRAY, 



FISHER PROFESSOR OF NATURAL HISTORY IN HARVARD UNIVERSITY. 



RY 



jmtl) HMtion. 



:..»l 



WITH TWENTY PLATES, 



ILLUSTRATING THE SEDGES, GRASSES, FERNS, ETC. 



NEW YORK: 

 IVISON, PHINNEY, BLAKEMAN, & CO. 



CHICAGO : S. C. GRIGGS & CO. 

 1867. 



