1898—1902. No. 16] FLOW. PLANTS AND FERNS OF N..W.GREENLAND. 41 
How it has got there is a somewhat more difficult question to solve. 
I refer it alternatively to Group A, or Group D. 
Androsace septentrionalis, forming Group III, 4, as absent from 
Greenland goes to Group A. Group III, 5, contains 3 species, of which 
one seems to be decidedly american, viz. Potentilla rubricaulis; the 
two others are more dubious, and so give rise to a question as to 
whether they should be placed in Group A, or in Group D. Sawifraga 
flagellaris is spread round the Arctic Regions lo Spitsbergen, but its uni- 
versal appearance throughout Arctic America and the islands, its manner 
of distribution in Ellesmereland and in N. W. Greenland, make it most 
probable that it is an american immigrant in Greenland. Pleuropogon 
Sabinei is spread from Siberia to Novaja Semlja and Franz Joseph 
Land; but its absence from Spitsbergen, and its range over the Arctic 
Islands to Ellesmereland, make it probable that it has reached even 
N. E. Greenland that way. 
The 5 species in Group IV, 1, Campanula rotundifolia, Rhodiola 
rosea, Juncus castaneus, J. triglumis, Poa alpina, must be reckoned 
to Group S. In N. E. Greenland alone they are spread into the area here 
in question, and none of them seems to reach its northernmost part. Even” 
those of them which have an uninterrupted distribution in the south, 
may, perhaps, have immigrated from both sides, as they are spread both 
in Europe, inelnding Iceland, and in America. The same is the case 
with Festuca rubra, which forms Group IV, 2. Carex aquatilis, Group 
IV, 3, is absent from N. E. Greenland, and its distribution in the north- 
ern part of Danish Greenland, points to an american origin. I there- 
fore place it in Group A, notwithstanding that it is not found as yet in 
N. W. Greenland. 
In Group V, 1, we have the two new Ellesmereland species, the 
distribution of which is as yet unknown; it is possible that Sawifraga 
*exaratoides may count as american, Poa evagans must, however, be 
left out of consideration at present. Taraxacum pumilum (Gr. V, 2) 
most probably may be reckoned as american. 
Group VI, 1, contains 7 species, all absent from Ellesmereland but 
found in the five neighbouring districts entered in the table. Among 
them, Potentilia nivea, Honkenya peploides, and Carex rigida, are 
rather ubiquitous species that may yet be found in Ellesmereland. 
I refer them to Group U, together with Salix herbacea, absent from 
Spitsbergen (but found in Beeren Island and Jan Mayen) and perhaps 
from the Bering Sea region. Tofieldia palustris and Carex scirpoidea 
are absent from Western Siberia; Rhododendron lapponicum also from 
