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SMITHSONIAN INSTITUTION 



UNITED STATES NATIONAL MUSEUM 



CONTRIBUTIONS 



FROM THE 



United States National Herbarium 



Volume 21 



FLORA OF THE DISTRICT OF COLUMBIA 

 AND VICINITY 



By A. S. HITCHCOCK and PAUL C. STANDLEY 



WITH THE ASSISTANCE OF THE BOTANISTS 

 OF WASHINGTON 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1919 



