MANUAL 



OF 



THE FLORA 



OF THE 



NORTHERN STATES AND CANADA 



BY 



NATHANIEL LORD BRITTON, Ph.D. 



Director-in-Chief of the New York Botanical Garden 

 Emeritus Professor of Botany in Columbia University 



THIRD EDITION, REVISED AND ENLARGED 



NEW YORK 



HENRY HOLT AND COMPANY 



1907 



