The Flora of Greenland and Its Origin. 37 



immigration in tlie days of the Norsemen, which gives a 

 maximiim age for these cases of endemism of abt. 900 years. 



XI. Distribution of the Species throughout Greenland. 



It is but natural, of course, that some species should 

 be more widely distributed througliout Greenland than 

 others. Those of widest range are the 32 species found 

 from the North Coast right to the southern extremity. 

 Between this and its opposite, viz. occurrence restricted to 

 a single locality, we have all possible degrees of transition, 

 as w'ill be seen from the General List. The number of 

 rare species, i. e. those found only in one or some few 

 piaces, is very large. This is already apparent from the 

 faet that a number of species are known from only one of 

 the 15 districts. Richest in this respect is the South 

 District, I, which has 36 species to itself. It is a far cry from 

 this to W. II whith B species (Sagina nodosa, Geranium 

 silvaticiim, Viola Selkirkii, Andromeda glaucophijUa, Primula 

 egalikensis and Carex polygama), W. IV with 5 (Cerastium 

 arvense, Braija humilis, Arctostaphylos uva nrsi, Andromeda 

 polifolia and Utricularia intermedia), W. III with 3 species 

 (Ranuncnlus cijmbalaria, Arctophila fulva and Zostera marina), 

 W. VII with 2 species (Pedicularis arctica and P. capitaia), E. 

 III with 2 (Sedum acre and Alchimilla acutidens), E. V with 2 

 (Draba repens and Carex parallela), E. VI with 1 (Polemonium 

 boreale) and W. VIII with 1 (Taraxacum pumilum). Generally 

 speaking, we may take it that species with a narrow^ range 

 of distribution are recent immigrants, while those widely 

 distributed throughout the country have presumably been 

 there for a longer time. 



As will be further considered in the following, tliese 

 immigrant species must be divided into those coming 



I 



