The Flora of Greenland and its Origin. 



53 



having come from America, or (as regards some 60 species) 

 have lived in Greenland prior to the glacial maximum. 



Among immigration routes, special attention is drawn 

 to the narrow Smith Sound and Kennedy Channel to the 

 NW, and to the faet that a post-glacial heat maximum 

 existed, so that this route could be followed by more 

 southerly species than at the present day. Furthermore, 

 mention is made of immigration from the NE with the 

 drift ice of the polar current; otherwise, immigration must 

 have been effected by wind and hirds carrying seeds etc. 

 across the sea. Special importance probably attaches to the 

 action of the wind in winter, when seeds and portions of 

 piants can be swept along over the frozen straits before 

 the storm. It is considered unnecessary to assume any 

 post-glacial land-conneclion to the west and east. 



Explanations to the General List on pp. 54 — 69. 



The W and E prefixed to the plant names mean that the 

 species in question occurs onlj' inWest,respectively East Greenland. 



The letters {G, A, S etc.) after the tabular indications of di- 

 stribution have been explained on p. 24. 



The plant nanies printed in italics are the names of the sup- 

 posed old Norse piants. 



