PREFACE. IX 



Alaska has been included in the catalogue, as its flora is that of our 

 westei-n coast and north-western interior region. Besides the refer- 

 ences to it taken from Hooker's Flora Boreal i Americana, I have used 

 Dr. J. T. Eothrock's Catalogue of Alaskan Plants, published in the 

 Smithsonian Eeport for the year 1867. 



All plants which are common to British North America and Green- 

 land are introduced. The catalogue used is that of Sir Joseph Hooker, 

 in the Arctic Manual published in 1875. 



In conclusion, I would again state that the present work is by no 

 means final, and would invite the co-operation of botanists in all parts 

 of Canada in the work of adding to our list of species and assisting to 

 define the limits and varietal range of those already known. 



JOHN MACOUN. 



Ottawa, April 1883. 



