1898-1902. No. 2.] VASCULAR PLANTS OF ELLESMEREL.\ND. 13 



decidedly american origin, all found in Ellesmereland but not spread to 

 the south in Greenland; these are Pedicularis capitata, P. ardica, 

 Ranunculus Sabinei, Taraxacum hyparcticum to which may be 

 added: Potcntilla Vahliana (south to 69°), Arabis arenicola (all over 

 West Greenland), Hesperis Pallasii (spread from America through 

 Arctic Asia to Novaja Semija, but absent in East Greenland and Spits- 

 bergen), Aspidium fragrans (it has probably come to its South Green- 

 land area by some other way than from Ellesmereland). Species that 

 have immigrated by way of Ellesmereland but have spread also to 

 North-eastern Greenland are: Potentilla rubricaulis, Saxifraga tri- 

 cuspidata (in West Greenland south to 64 °), Lesquerella arctica (west 

 coast to 69°), Erigeron compositus and Dryas integrifolia (all over 

 the west coast), Pleuropogon Sabinei (although occurring even in Arctic 

 Asia, Novaja Semija and Franz Joseph Land). Poa abbreviata is a 

 common arctic American plant, spread in Greenland in both coasts 

 south to 70°; although it is found in Spitsbergen, Franz Joseph Land 

 and Novaja Semija, it must be assumed to be an immigrant from the 

 west; the same is the case with Aira caespitosa var. arctica, although 

 as yet only known from the northern east coast. Kobresia bipartita 

 and Dupontia Fisheri are not yet found in North-western Greenland, 

 but as the former, which is absent from the whole of Arctic Asia and 

 Europe, is found only north of 64 ° in the west, and of 71 ° in the east 

 coast of Greenland, and the latter only within a limited area of Danish 

 Greenland, they must be regarded as western species. Aira flexuosa 

 is not as yet known from other arctic localities in America and might 

 possibly be an eastern immigrant, but as it is found in Labrador it has 

 most probably come that way to Greenland, even if it may have come 

 to Ellesmereland from the south-east, that is to say from Greenland. 



The Ellesmereland species not found in Greenland and of a deci- 

 dedly american origin are: Androsace septentrionalis, Chrysosplenium 

 alternifolium (representing genera lacking in Greenland), Alsine Rossii, 

 Carex membranopacta. Among the 72 circumpolar species there are 

 four, the Greenland distribution of whicli is such, as to make their 

 western immigration thither probable, viz. : Saxifraga flagellaris, Braya 

 purpurascens, Eutrema Edwardsi, Ranunculus affinis. Finally, the 

 distribution of the following species is too little known as yet for any 

 opinion to be formed about their original home and ways of migration : 

 Taraxacum phymatocarpum, T. pumilum, Saxifraga * exaratoides, 

 Draba subcapitata, Sagina intermedia, Glyceria Vahliana, G. an- 

 gustata, Poa evagans. 



