^. 



f CPC^-Cf^ 



A Journal of General Botany 



V O L U M Ei 2 

 JSr U M B E R 4 

 APRIL, 1917 



CONTAINING 



Plant Association of Western Pennsylvania with Special Reference to 

 Physiographic Relationship. 

 J. E. Cribbs 97 



Critical Flowering and Fruiting Temperatures for Phytolacca decandra. 

 Francis E. Lloyd 121 



Books and Current Literature 127 



Notes and Comment 132 



PUBLISHED MONTHLY 



OFFICE OF PUBLICATION 



2419-21 Greenmotjnt Ave. 



BALTIMORE, MD. 



EDITORIAL OFFICE 



TUCSON. ARIZONA 



£nt«red as eeoond-class matter March 9^ 1912, at the post office at Baltimore, Maryland, under the Act of July 16, 1804 



