SMITHSONIAN INSTITUTION 



UNITED STATES NATIONAL MUSEUM 



CONTRIBUTIONS 



FROM THE 



Dnited States National Herbariom 



Volume 23, Part 4 



TREES AND SHRUBS OF MEXICO 



(PASSIFLORACEAE-SCROPHULARIACEAE) 



By PAUL C. STANDLEY 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1924 



