RECENT DISCOVERIES IN THE SOUTH NORWEGIAN FLORA 259 



Oederi is totally lacking. The same is true for all the Hardangervidda which 

 has been thoroughly investigated by Curator Johannes Lid. 



UPedicularis Oederi, which does occur in the Alps, had dispersed to Norway 

 from the south during the deglaciation, the species ought to have gained a 

 foothold just in the petrographically so favorable area which is mentiond 

 above. But instead it is really conspicuous by its absence there. The southern 

 limit of this species shows with all desirable clarity that it has reached the 

 northernmost part of Hardangervidda/row the north, not from the south. 



In a paper written already in 1930, I drew attention to this fact. Pedicularis 

 Oederi must have survived the Last Glaciation on the More coast and from 

 there spread towards east, northeast and south during the deglaciation. 

 Investigations by other Norwegian botanists as well as by myself have also 

 demonstrated that in those parts of Norway where the species has its main 

 center it possesses biotypes which are able to grow on rock poor in lime, and 

 also biotypes which can descend into low regions, as far down as to 400 m above 

 sea level. The species has been observed both in south Trondelag and in 

 north More in hillside bogs in the Piims sihestris region. During its dispersal 

 southwards in Norway, the number of biotypes inside this species seems to 

 have diminished strongly because at its southern hmit the plant is confined 

 exclusively to more or less calcareous habitats above the upper limit of the 

 birch forest. 



The peculiar geographical distribution in Norway of Pedicularis Oederi 

 seems to be, really, the strongest botanical argument that we have in favor of 

 the survival theory. 



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