ADVERTISEMENT. 



This work is intended to facilitate the labors of botanists by 

 furnishing references to all the published descriptions of sjiecies of 

 the flora of North America, with a chronological arrangement of the 

 synonymy, and is published by the Smithsonian Institution at the 

 request of the leading botanists of the United States, who have also 

 contributed to the expense of its preparation. 



The first part of the work is now published, as this covers the 

 ground of Vol. I, of Torrey & Gray's Flora of North America, and 

 is complete in itself : the remainder will be printed as soon as the 

 manuscript can be furnished by the author. 



Washington, March, 1878. 



JOSEPH HENRY, 



Secretary Smithsonian Institution. 



