N. 



S. Norway, 



W. 



Sweden 



North 

 Holland 



Central Europe 



Absolute affinities for the Juncetum gerardii 



W. 



— North 



Holland 



'Central Europe 

 S. 



S. W. Sweden 

 50.7 



Absolute affinities for the Artemisietum maritimi 



The same technique has been used to compare salt marsh communities 

 occupying similar ecological niches from different parts of the world where 

 there are several species of common genera. In such cases the species of 

 these common genera have been equated. Some results are as follows: 



A Asteretum tripolii (S. Sweden) 



Aster tenuifolius - Puccinellia salinaria (Central Europe 



B Aster tenuifolius -P. salinaria (Central Europe^ 

 Aster tripolium -P. maritima (Norway 



) 



C Aster tripolium -P. maritima (S. W. Sweden ) 

 Aster tenuifolius -P. salinaria (Central Europe ) 



) 



) 3 3.8% 



40% 

 52% 



50 



