TAXONOMIC DIFFERENTIATION 



93 



p. dahlianum, and the third is the species that Nordhagen and Knaben 

 consider to be the true P. radkatum but for which Love (1955) has coined the 

 new name P. nordhagenianum. If Love's views on the typification of P. 

 ladicatum are correct and if P. nordhagenianum is taken in the broad sense 

 that Knaben and Love now take it, its correct name seems to be P. relictum. 



The last-named species has a total distribution comparable to that of 

 Poa flexuosa, except that it does not grow in Scotland, instead the Faeroe 

 Islands is an additional area. Its distribution in the Scandes differs from that 

 of the Poa, as the poppy is bicentric and the Poa southern. Moreover, the 

 poppy is very polymorphous and split up in a number of races with limited 

 distribution. With the more detailed and refined studies their number has 

 increased to ten, six in the southern part-area (Fig. 4) and four in the northern. 



Fig. 4. Distribution areas of the six south Norwegian subspecies of Papaver 



radkatum (After Knaben 1959). J. relictum. 2. intermedium. 3. ovatilobum. 



4. GJaere colli 5. groevudalense 6. oeksendalense 



But it is not sufficient with this splitting-up. The poppies are very rare plants. 

 They inhabit very restricted localities, and the individuals in each locality 

 are very few. These local populations are very homogeneous in themselves 

 but differ markedly from the populations of even the most adjacent localities, 

 although the differences inanifest themselves very little in the physiognomy of 

 the plants but almost exclusively in their chromosome structure. The differences 

 between the races mentioned above and equipped with taxonomic names 

 are of a higher class of magnitude, they manifest themselves clearly in the 

 physiognomy and also the differences in chromosome structure are much 



