185 



the East-Frisian and only half of them on the West-Frisian 

 are the following: 



The foregoing shows, that there is a considerable dif- 

 ference between the vegetation of the North-Frisian and 

 that of the East-Frisian Islands, a fact all the more obvious 

 as all the 321 plants common to both are wide-spread: 

 some are common in West-Jutland, some in the West-Fri- 

 sian Islands, some in the sandhill-formations of South-Hol- 

 land and many are to be found in common in all three 

 places. While the East- and the West-Frisian Islands are 

 closely connected with North- and South-Holland, the North- 

 Frisian Islands attach themselves to West- Jutland not only 

 through the individual elements composing the vegetation 

 but especially through the vegetation itself. In wandering 

 across the higher parts of Amrum, Føhr and Sylt we do 

 not observe any ' difference between the vegetation here 

 and that of the poor and high grounds of Aadum- Varde 

 or Heinsvig-Hjerting „Insular-Hill" o: „Bakkeø"*) in West- 

 Jutland, and we may therefore consider the North-Frisian 

 Islands as the remains of a similar Insular-Hill, which once 



Lycopodium davatum 

 Carex pilulifera 

 Aïra 'flexuosa 

 Holcus mollis 

 Scleranthus annuus 

 Silène inflata 

 Hypericum perforatum 



Ornithopus perpusillus 

 Trientalis enropaea 

 Ihymus Serpyllum 

 Campanula rotundifolia 

 Knautia arvensis 

 Filago arvensis 

 Gnaphalium silvaticum 

 Scorzonera humilis 

 Arnica montana 

 Carlina vulgaris 

 Arnoseris pusilla 



Genista anglica 

 — pilosa 



pulchrum 

 humifusum 



■ Potentilla argentea 

 Alchemilla vulgaris 

 Sarothamnus scoparius 

 Genista -tinctoria 



a. o. 



*) „Bakkeø": the danish name for islelike hillocks of clayey drift ri- 

 sing out of almost deadlevel flats of pure sand. 



