GENERA 



FLORAE AMERICA BOREALI-ORIENTALIS 



ILLUSTRATA. 



THE GENERA 



PLANTS OF THE UNITED STATES 



ILLUSTRATED 

 BY FIGURES AND ANALYSES FROM NATURE, 



By ISAAC SPRAGUE, 



MEMBER OP THE BOSTON NATURAL HISTORY SOCIETY. 



SUPERINTENDED, AND WITH DESCRIPTIONS, &c., 



By ASA GRAY, M. D., 



FISHER PROFESSOR OF NATURAL HISTORY IN HARVARD UNIVERSITY, 



CORRESPONDING MEMBER OF THE ROYAL BAVARIAN ACADEMY, MEMBER 



OP THE IMPERIAL ACADEMY NATOR.E CURIOSORHM ; OP THE 



BOTANICAL SOCIETY OF RATISBON, &C., &C. 



PLATES 101 — 186. 



■-C 



(^ 



NEW YORK: 

 GEORGE P. PUTNAM. 



LONDON: PUTNAM'S AMERICAN AGENCY. 



1849. 



