14 



VEGETATION IN COLORADO-HOLM. 



[Memoibs National 

 [Vol. XIX, 



It vpill be seen from this table that 63 of the Alpine species occur also in the Arctic regions 

 and that 31 of these are even circunipolar, viz: 



Thalictrum alpinum. 

 Papaver nudicaule. 

 Silene acaulis. 

 Cerastium alpinum. 

 Stellaria longipes. 

 Alsine propinqua. 

 A. hiflora. 

 Sagina Linnaei. 

 Dryas octopetala. 

 Saxifraga flagellaris. 

 S. cernua. 

 S. nivalis. 

 Iihodiola rosea. 

 Chamaenerium latifolium. 

 Artemisia borealis. 



Erigeron unijlorus. 

 Arnica alpina. 

 Campanula uniflora. 

 Androsace Chamaejasme. 

 Polygonum viviparum. 

 Oxyria digyna. 

 Salix reticulata. 

 Lloydia serotina. 

 Luzula spicata. 

 Juncus biglumis. 

 Carex rigida. 

 0. misandra. 

 Trisetum subspicatum. 

 Poa fiexuosa. 

 Festuca ovina. 



Antennaria alpina. 



The Arctic element is distributed as follows : Fifty-three species are known from Greenland 

 49 from Arctic Russia, 49 from Arctic North America, 39 from Arctic Siberia, 32 from Nova 

 Zembla, 24 from Spitzbergen, 51 are known also from Scandinavia, and by extending the 

 comparison to the Alpine regions of the mountains in Europe and Asia 50 of these Arctic- 

 Alpine species occur also in Baikal and Altai Mountains, 39 in the Alps and Pyrenees, 32 in 

 Caucasus, and finally 24 in the Himalayas. 



Absent from the polar regions but recorded from some mountains farther south in Europe 

 or Asia we observe Stellaria umbellata from Baikal ; Swertia perennis from the Alps and Pyrenees, 

 beside Caucasus; Carex pyrenaica from the Alps and Pyrenees, Caucasus, Japan, and New 

 Zealand; Carex siccata from Baikal, and finally Carex melanocepliala from Caucasus, Baikal, 

 and Turkestan. Of these the last species, C. melanocephala, was identified by the late C. B. 



