SM 1 TH S ON I A N INS T IT U T 1 N 

 UNITED STATES NATIONAL MUSI 



. CONTRIBUTIONS 



FROM TMH 



United States National Itaii.uiim 



Volumh X. Part 2 



THE GENUS PTELEA I\ THE WESTERN' AND SOUTHWESTERN 



UNITED STATES AM) MEXICO 



By EDWARD L. GREENE 



WASHINGTON 

 GOVERNMENT PRINTING OFFICE 



I "Ob 



