FIELD MUSEUM OF NATURAL HISTORY. 

 t \ 



PUBLICATION 204. 



BOTANICAL SERIES. VOL. IV, No. 2. 



REVISION OF THE NORTH AMERICAN 

 SPECIES OF XANTHIUM 



BY 



CHARLES FREDERICK MILLSPAUGH 



AND * 



EARL EDWARD SHERFF. 



CHARLBS FREDERICK MILLSPAUGH 

 Curator, Department of Botany. 



JUL 

 UNIYERSJiy Of 



CHICAGO, U. S. A. 



Issued April 30, 1919. 



