26 



Holm, The genus Carex in North -West America. 



Japan, and 62 to China; a still larger number is peculiar to 

 Himalaya. In Mr. Cheeseman's revision of the New Zealand Carices 

 26 species are said to be peculiar to these Islands, where the total 

 number of species aggregates only 42. 



C. The g-eographical distribution of the Carices of 

 North -West America. 



In this chapter we have endeavoured to illustrate the distri- 

 bution of these species throughout the Northern hemisphere, and 

 especially in the arctic re;4ions. We have extended the ränge to 

 Iceland, Faeroe Islands and Great Britain in order to show the 

 presence of some of these species on Islands, which, to some 

 extent, may be brought in connection with their occurrence on 

 the mainland of Europe, thus demonstrating their probable roads 

 of migration during or after the glacial epoch. Furthermore when 

 including the South European IVlountains, Caucasus, Altaj and 

 Bajkal Mountains, besides the Himalayas, we desired to show the 

 occurrence of these same species at higher elevations in the 

 mountaineous districts farther South so as to indicate the pro- 

 bability of more than one geographical center of distribution. 



Our comparison with the Flora of the Himalayas is mainly 

 based upon Mr. C. B. Clarke's treatment of the Ci/peraceae in 

 Sir Joseph Hooker 's Flora of British India; in the column con- 

 taining species from Eastern Asia we have consulted Franchet's 

 work ,,Le Carex de l'Asie Orientale" and Professor Kj eil man 's 

 ,,Asiatiska Beringssunds-Kystens Fanerogamflora". 



