AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
EDITORIAL COMMITTEE 
C. E. Allen, Editor-in-Chief 
University of Wisconsin 
C. Stuart Gager, Business Manager L. R. Jones, 
Brooklyn Botanic Garden University of Wisconsin 
R. A. Harper, Edgar W, Olive, 
Columbia University Brooklyn Botanic Garden 
A. S. Hitchcock, Jacob R. Schramm, 
Bureau of Plant Industry Cornell University 
F. D. Kern, State College of Pennsylvania 
(Representing American Phytopathological Society) . 
VOLUME VL 1919 
WITH FORTY-ONE PLATES AND NINETY-SIX TEXT FIGURES 
PUBLISHED 
IN COOPERATION WITH THE BOTANICAL SOCIETY OF AMERICA 
BY THE 
BROOKLYN BOTANIC GARDEN 
V 
At 41 North Queen Street, Lancaster, Pa. 
