^7/ 





4/0 5^C!// 



UNITED STATES 



EXPLORING EXPEDITION. 



DURING THE YEARS 



1838, 1839, 1840, 1841, 1842. 



UNDER THE COMMAND OF 



CHARLES WILKES, U. S. N. 



ATLAS. 



BOTANY. 



PHANEROGAMIA. 



VOL. I. 



BY 



ASA GRAY, M.D. 



BY AUTHORITY OF CONGRESS. 



PHILADELPHIA: 



C. SHEEMAN & SON, PEINTEES. 



185 6. 





