AN 



ILLUSTRATED FLORA 



OF THE 



NORTHERN UNITED STATES, CANADA 

 AND THE BRITISH POSSESSIONS 



FROM NEWFOUNDLAND TO THE PARALLEL OF THE SOUTHERN BOUNDARY OF 



VIRGINIA, AND FROM THE ATLANTIC OCEAN WESTWARD 



TO THE 102o MERIDIAN 



BY 



NATHANIEL LORD BRITTON, PH.D., Sc.D., LL.D. 



DIRECTOR-IN-CHIEF OF THE NEW VORK BOTANICAL GARDEN; PROFESSOR IN COLUMBIA UNIVERSITY 



AND 



HON. ADDISON BROWN, A.B., LL.D. 



PRESIDENT OF THE NEW VORK BOTANICAL GARDEN 



THE DESCRIPTIVE TEXT 



CHIEFLY PREPARED BY PROFESSOR BRITTON, WITH THE ASSISTANCE OF SPECIALISTS IN 

 SEVERAL GROUPS; THE FIGURES ALSO DRAWN UNDER HIS SUPERVISION 



SECOND EDITION REVISED AND ENLARGED 

 IN THREE VOLUMES 



VOL. I. 



OPHIOGLOSSACEAE TO POLYGONACEAE 



FERNS TO BUCKWHEAT 



