DR. HOOKER ON THE DISTRIBUTION OF ARCTIC PLANTS. 271 



The Arctic Greenland flora contains 206 species, according to Lange's catalogue (in 



Rincke's ' Greenland ') ; or 207, according to my materials ( ^. , ' ^ =1 : 2-1 1 : the 



VDicot. . 140 J / 



proportion of genera to species being 1:2. 



Of these 207 species the following 11 alone are not European : — 



Anemone Richardsonii (Asiatic). Potentilla tridentata (Labrador only). 



Turritis mollis (Asiatic). Saxifraga triscuspidata (Labrador only). 



Vesicaria arctica (American only). Erigeron compositus (American only). 



Drabaaurea (Rocky Mts. and Labrador only)- Pedicularis euphrasioides (Asia). 



Hesperis Pallasii (Asia and America). Salix arctica (Asia). 

 Arenaria Graenlandica (Mts. of U. S.). 



On the other hand, no less than 57 Arctic Greenland species are absent in Arctic East 

 America, and the following 36 Arctic Europe and Greenland species are either absent in 

 all parts of Eastern Temperate America, or are extremely local there : — 



Arabis alpina (Labrador only). Phyllodoce taxifolia (do. and White Mountains). 



Lychnis alpina (do.). Gentiana nivalis (Labrador only). 



Lychnis dioica (absent). Thymus serpyllum (absent). 



Spergula nivalis (do.). Veronica alpina (White Mountains only). 



Arenaria uliginosa (absent). saxatilis (absent). 



ciliata (do.). Euphrasia officinalis (N. U. States). 



Stellaria cerastioides (do.). Bartsia alpina (Labrador only). 



Alchemilla alpina (do.). Rumex acetosella (absent). 



vulgaris (Labrador only). Salix Arbuscula (do.). 



Sibbaldia pi-ocumbens (United States only). Peristylus albidus (do.). 



Rubus saxatilis (absent). Carex capitata (White Mountains only). 



Potentilla verna (Labrador only). microglochin (absent). 



Sedum villosum (absent). — — microstachya (do.). 



Saxifraga Cotyledon (Labrador and Rocky Moun- pedata (do.) . 



tains only). Elyna caricina (Rocky Mountains only). 



Galium saxatile (absent). Phleum alpinum (Labrador and White Moun- 

 Gnaphalium sylvaticum (Labrador only). tains only). 



supinum, L. (do. and White Mountains). Calamagrostis lanceolata (Labrador only). 



Cassiopeia hypnoides (Labrador only). Deschampsia alpina (absent). 



When it is considered how extremely common most of these plants are throughout 

 Europe and Northern Asia, and that some of them inhabit also N."VV. America, their 

 absence in Eastern America is even more remarkable than their presence in Greenland. 



Another singular feature of both Arctic and Temperate Greenland is its wanting a 

 vast number of Arctic plants which are European, and found also in America. The 

 following is a list of most of these, excluding about 15, which are water-plants, or 

 species whose range is limited. The letter I. placed before a species signifies that it is 

 Icelandic, and I have introduced it to show not only how many are absent from this 

 island also, but how many are present. The letter S. indicates that the species is found 

 in the south temperate or antarctic circle. The asterisk * indicates that the species is 

 arctic both in East America and Europe. 



