UNITED STATES GEOLOGICAL EXPOLRATION OF THE FORTIETH PARALLEL. 



CLARENCE KING, GEOLOGIST-IN-CHARGE. 



BOTANY. 



SERENO WATSON, 



AIDED BY 



PROF. DANIEL 0. EATON, AND OTHERS. 



SUBMITTED TO THE CHIEF OF ENGINEERS AND PUBLISHED BY OBDER OF THE SECBETAEY OF WAR 



UNDER AUTHORITY OF CONGRESS. 



ILLUSTBATBD BT A MAP AND JOETY PLATES. 



WASHINGTON: 



GOVEENMENT PRINTING OFFICE, 

 1871. 



