The Flora of Greenland and its Origin. 



45 



The circumpolar species (Group G) number no fewer 

 than 209. Of these, a considerable number occur only in 

 West Greenland, and in the case of these it is natural to 

 regard them as of western origin. There are 26 species 

 in all: 



Equisetum hieniale. 

 Isoétes echinosporum s. 1. 

 Lycopodium clavatum. 

 Athyrium alpestre. 

 Dryopteris dilatata. 



— fdix mas. 



Selaginella selaginoides. 

 (^allitriche autumnalis. 

 Arenaria cil. norvegica\ 

 Cornus suecica^. 

 Radicula islandica. 

 Myriophyllum alternifloruni. 

 — spicatum, var. 



Arctostaphylos uva ursi. 

 Vaccinium vitis idæa. 

 Lomatogonium rotatum. 

 Menyanthes trifoliata. 

 Utricularia minor. 

 Heleocharis acicularis. 

 Agropyrum violaceum. 

 Catabrosa aquatica. 

 Coralliorhiza trifida. 

 Listera cordata. 

 Potamogeton alpinus. 



— gramineus. 



Sparganium hyperboreum. 



Several of these occur as distinct varieties, corresponding 

 to those found in North America. With the exception of 

 Arenaria norvegica {cylindrocarpa Fernald), they are all 

 "southerly" species, and there are comparatively many 

 aquatic piants among them. 



Of the 183 species remaining, 27 are old Norse piants, 

 leaving 156, of which again I consider 26 as possibly 

 glacial species, i. e. dating from before the glacial maximum 

 in Greenland, viz: 



Equisetum arvense. 



— variegatum. 



Lycopodium selago. 

 Cerastium alpinum. 

 Minuartia rubella. 



Sagina intermedia. 

 Silene acaulis. 

 Cardamine bellidifolia. 

 Cochlearia officinalis s. 1. 

 Draba alpina. 



' Probabl}' the American subspecies cylindrocarpa Fernald. 

 '" Also on the southernmost part of the East Coast. 



I 



