THE PLANT WORLD 



A Monthly Magazine of General Botany 



Established 1897 



Edited by 



FORREST SHREVE 



Published by 



THE PLANT WORLD ASSOCIATION 



Volume 18 



OFFICE OF PUBLICATION 



2419-21 Greenmount Ave. 



baltimore, md. 



EDITORIAL OFFICE 



TUCSON, ARIZONA 



1915 



