RtCENT DISCOVERIES IN THE SOUTH NORWEGIAN FLORA 



247 



condition is especially evident in Norway, where we find a concentration of 

 interesting species partly in the area north of Jotunheimen over Mt. Dovre to 

 TroUheimen and the Sunndal Mts., partly from Saltdal in Nordland County 

 to west Finninark (Fig. 5). 



Fig. 4. Map of the two "island"-like areas in the Scandinavian Mts. which have an 

 unusually rich mountain flora (after Nordhagen, 1936). 



(c) The northern imicentric group, or plants confined to the northern 

 "island", where it occurs together with a number of "bicentric" species 

 (Fig. 5). 



(d) The southern unicentric group, or plants connected exclusively to the 

 "island" area in the southern Norwegian mountains (Fig. 5). 



I was myself for a long while very sceptical towards the "survival" theory, 

 which is evident in my thesis for the doctorate from 1921. But after an exten- 

 sive journey in 1930 through Norway from the Valdres Mts. in the south all 

 the way to the Varanger Peninsula in the northeast in order especially to 

 study in nature the populations of Papaier sect. Scapiflora which appear in 

 Scandinavia, I became a convert to this theory (Nordhagen, 1931, 1936). 



