GENERA 



FLORAE AMERICA BOREALI-ORIKNTALIS 



ILLUSTRATA. 



THE GENERA 



OF THE 



PLANTS OF THE UNITED STATES 



ILLUSTRATED 



BY FIGURES AND ANALYSES FROM NATURE, 



By ISAAC SPRAGUE, 



MEMBER OF 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 



OF THE IMPERIAL ACADEMY NATURAE CURIOSORVM ; OF THE 



BOTANICAL SOCIETY OF RATISBON, ScC, &.C. 



VOL. I. 



PLATES 1-100. 



BOSTON : 

 JAMES MUNROE AND COMPANY. 



NEW YORK AND LONDON: 

 J H N WILEY. 



1848. 



