308 



STEINDOR STEINDORSSON 



will appear. Five of them, Car ex rufina, Draba mpestris, Epilobium lactiflomm, 

 Euphrasia frigida, and Festuca vivipara, are common throughout the whole 

 country, so we cannot point out any center for their occurrence; but E. 

 lactiflorum shows faint tendencies to centricity in three different districts. 



so OOKi 



Fig. 2. Campanula uniflora. 



AV 





)-^^-'-^\ 



Fig. 3. Carex Macloviana. 



Five others of these species have a distinct center in the Eyjafjordur district, 

 i.e. Campanula uniflora, Carex macloviana, Carex nardina, Erigeron unalasch- 

 kensis, and Sagina caespitosa (Figs. 2-5). 



The localities outside the district where these species are found can either 

 be explained with a view to direct distribution from the center or as being 



