Vol. VI. MARCH, 1919 No. 3 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
The ecologic subterranean anatomy of some plants of a prairie province in 
central Iowa Ada Hayden 87 
Studies concerning the evolutionary status of polycotyledony. 
John T. Buchholz 106 
The role of sedges in some Colorado plant communities. Francis Ramaley 120 
PUBLISHED 
IN COOPERATION WITH THE BOTANICAL SOCIETY OF AMERICA 
BY THE 
BROOKLYN BOTANIC GARDEN 
At 41 North Queen Street, Lancaster, Pa. 
Entered as second-class matter February 21, 19^4, at the post office at Lancaster, Pennsylvania, 
under the act of March 3,1 879 
