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 A. S. Hitchcock, 
Brooklyn Botanic Garden Bureau of Plant Industry 
Irving W. Bailey, Edgar W. Olive, 
Bussey Institution Brooklyn Botanic Garden 
R. A. Harper, Jacob R. Schramm, 
Columbia University Cornell University 
F. D. Kern, State College of Pennsylvania 
(Representing American Phytopathological Society) 
O -J q 1 
JAM 
VOLUME V "1918 
WITH THIRTY-SIX PLATES AND THIRTY-SEVEN TEXT FIGURES 
PUBLISHED 
IN COOPERATION WITH THE BOTANICAL SOCIETY OF AMERICA 
BY THE 
BROOKLYN BOTANIC GARDEN 
At 41 North Queen Street, Lancaster, Pa, 
