MANUAX. 



THE B OTAm^ 



THE NORTHERN UNITED SMTES,*^'^ 



CLUDING THE DISTRICT EAST OF THE MlSSISaPP||AyD. 

 NOBTH OF NORTH CAROLINA AND TENNE^H^ 



ARRANGED ACCORDING TO THE NATURAL SYSTEM. 



By ASA GRAY, 



FtSHBR PROFESSOR OF NATURAL HISTORY IN HARVARD UNIVERSITY. 



SflUi Eirtton. "'■' ' 



WITH TWENTY PLATES, 



ILLUSTRATING THE SEDGES, GRASSES, PERNS, ETC. 



NEW YORK: 



IVISON, PHINNEY, BLAKEMAN, & CO. 



CHICAGO : S. C. GRIGGS & CO. 



1867. 



