PKEPACE. IX 



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

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

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

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

 Smithsonian Eeport for the year 1SG*1. 



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 18Y5. 



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 joarts 

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

 define the limits and vai-ietal range of those already known. 



JOHN MACOUN. 

 Ottawa, April 1883. 



