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SMITHSONIAN INSTITUTION 



UNITED STATKS NATIONAL M U S !• U M 



CONTRIBUTIONS 



FROM THE 



States 



National Herbarioi 



Volume X. Part 2 



IHE GENUS PTELEA IN THE WESTERN AND SOUTHWESTERN 



UNUEEl) STATES AND MEXICO 



By EDNVARD L. GREENE 



WASHINGTON 



GOVliRNMHNT PRINTING OFFICE 



1906 



