MANUAL 



OF 



THE FLORA 



OF THE 



NORTHERN STATES AND CANADA 



BY 



NATHANIEL LORD BR1TTON, PH.D. 



Director-in-Chief of the New York Botanical Garden 

 Emeritus Prof essor of Botany in Columbia University 



THIRD EDITION, REVISED AND ENLARGED 



NEW YORK 



HENRY HOLT AND COMPANY 

 1907 



