SURVIVAL OF PLANTS ON NUNATAKS IN NORWAY 



271 



Caiex arctogena, and C parallela. The circumpolar, bicentric species Miim- 

 artia rubella, Luzula arctica, Carex misandra, and Rammcuhis nivalis all have a 

 similar distribution (Figs. 11-15). 



Furthermore, the same type of distribution is met with for some endemic 

 species. Thus Taraxacum dovrense occurs in the area of Jotunheimen- 

 Trollheimen (Fig. 16). Ecologically, if differs from all other alpine Taraxaca by 





Fig. 11. The distribution of Saginci caespitosa in southern Norway. 



growing in exposed localities, frequently together with Campanula uniflora. It 

 belongs to the cf/T^/ca-group, being its only representative in Scandinavia. Its 

 closest relative [T. reichenbachii) occurs in the Alps, and Dahlstedt, who 

 described the species, expressed the opinion as early as 1928 that these two 

 species originally were identical, occupying a common area before the Ice Age. 

 Draba dovrensis has a similar, but somewhat wider distribution. Stellaria 

 crassipes belongs to the bicentric element, and in the southern area it is 

 represented by an endemic race, var. dovrense Hult. So far it is known from 

 three localities only (Fig. 17). Normally, it seems to reproduce vegetatively. 



