+7 \ 50 8.2, 



Q77 US* 



1854- 



Bot- 



UNITED STATES 



EXPLORING EXPEDITION. 



DURING THE TEARS 



1888, 1839, 1840, 1841, 1842. 



UNDER THE COMMAND OF 



CHAELES WILKES, U.S.N. 

 VOL. XV. 



BOTANY. 



PHANEEOGAMIA. 



BY 



ASA GRAY, M. D. 



WITH A FOLIO ATLAS OF ONE HUNDRED PLATES. 



PART I. ^ 



PHILADELPHIA: 

 PRINTED BY C. SHERMAN. 



1854. 2> 



I MAY 06 1988 



