The Flora of Greenland and its Origin. 47 



the Norse Colonisation, leaving only 24 as brought by 

 Nature, which alters the percentage to 33 p. c. western and 

 7 p. c. eastern. The figure 113 is doubtless a minimum value 

 for the immigrants from the west, as it is natural to 

 suppose that out of the 203 "uncertain", i. e. whose 

 distribution outside Greenland might bring them either 

 from east or west, most should have come from the west, 

 since America is much nearer, and the West Coast of 

 Greenland offers much better conditions of life. It is, there- 

 fore, most reasonable to say that out ofthe 390 vascular 

 piants found in Greenland, only abt. 74 were 

 de ri ved from European sources, partly through 

 human agency; the remainder are probably of 

 western origin, or in some cases, were living in 

 Greenland prior to the glacial maximum. 



In conchision, we may briefly consider the routes by 

 which species might be supposed to make their way into 

 Greenland from west and east. The distance from North 

 America is least on the north, via Smith Sound and Kennedy 

 Channel, and it is natural to suppose that this route has 

 been much used and is still in use ; two species of 

 Pedicularis (P. arciica and P. capitata) have, as already 

 noted, only been found in Greenland in Inglefield Land, 

 close to Smith Sound; these were probably recent arrivals 

 from EUesmere Land. They are otherwise found all through 

 arctic America. Naturally the high-arctic and arctic species 

 in particular have utilised this route, and some of them 

 have gone only southwards in West Greenland, others 

 have also gone to the northward, round the north of 

 Greenland. 



In 1905 Ad. S. Jensen and P. Harder mentioned some 



I 



