heHRGHENS BOTAN ¥ 
KEY AND FLORA 
NORTHERN AND CENTRAL STATES 
EDITION 
BY 
JOSEPH Y. BERGEN, A.M. 
INSTRUCTOR IN BIOLOGY, ENGLISH Hicu ScHOoL, Boston 
LIBRARY 
NEW YORK 
BOTANICAL 
GARDEN 
BOSTON, U.S.A. 
GINN & COMPANY, PUBLISHERS 
The Atheneum Press 
1901 
