UNITED STATES GEOLOGICAL EXPOLRATION OF THE FORTIETH PARALLEL. 
CLARENCE KING, GEOLOGIST-IN-CHARGE. 
BOTANY 
SERENO WATSON, 
AIDED BY 
PROF, DANIEL C. EATON, AND OTHERS. 
SUBMITTED TO THE CHIEF OF ENGINEEilS AND PUBLISHED BY ORDER OF THE SECRETARY OF WAR 
UNDER AUTHORITY OF CONGRESS. 
II^IdTSTRATED BY A HAP AND iFOETY PLATES, 
WASHINaTON: 
GOVERNMENT PRINTING OFFICE. 
1871. 
