ICE AGE REFUGIA IN ICELAND 



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situated on some nunataks. The latter is especially the case with Sagina 

 caespitosa and Carex macloviana. 



Fig. 4. Carex nardina. 



Fig. 5. Eiigeron unalaschkensis (dots), Sagina caespitosa (triangles), and Stellaria 



calycantha (squares). 



Cerastium Edmondstonii has two centers, the Eyjaf jordur and the Austfirdir 

 districts; Pedicularis flammea seems to be tricentric, and Stellaria calycantha 

 (Fig. 5) seems to have a center in the Vestfirdir district. Two of these species, 

 Sagina caespitosa and Stellaria calycantha, are among the rarest of plants in 

 Iceland. 



Closely connected to the West Arctic group are five species which have been 

 characterized as North Atlantic, i.e. Alchemillafaeroeensis, Arenaria norvegica, 



X 



