1898—1902. No. 16] FLOW. PLANTS AND FERNS OF N.-W. GREENLAND, 39 
All these plants are tolerably common and widely-spread in the 
northern parts of America; in Greenland, they are in generai princi- 
pally distributed in the northernmost parts, that is to say, where the di- 
stance to the american area of the species is shortest. All of them, 
moreover, have a more or less discontinuous distribution, the inter- 
vening gap beginning either east of Greenland, or east of Spitshergen— 
Novaja Semlja. If we are to reckon these plants among the american 
immigrants, we must presume that those which inhabit, for instance, 
Spitsbergen also, have reached there in the same way as the species of 
Group II, 1 have come to N. E. Greenland, most probably along a for- 
mer land-bridge. I will not now, however, give them any definite place, 
but will reckon them alternatively to Group U, or Group A. 
Now we have only 2 species from Gr. I, 1, left to discuss. Taraa- 
acum phymatocarpum is only known from the northern parts of both 
Greenland coasts and from a single locality in Ellesmereland. It may 
be a Greenland plant and have reached Ellesmereland from there; but, 
as its Ellesmereland locality is in a region where the american feature 
is rather pronounced, it will more probably be found to have a wider 
distribution in Arctic America. It can be counted either in Group A, 
or in a Group G, containing Greenland plants, or also in the Group D, 
species of dubious distribution. Diapensia lapponica has so curiously 
interrupted a distribution, that one can hardly place it anywhere but in 
Group D, even if it has probably reached N. W. Greenland, and per- 
haps Ellesmereland, from Danish Greenland where it is common. 
The 5 species forming Group II, 1, are doubtless all immigrants 
from the east, as they are all found in Spitsbergen, mostly showing 
also a wider distribution in Europe and Asia. In Greenland, they are 
restricted to the northern parts of the east coast. Among them, Tar- 
acacum arcticum, Gentiana tenella, and Ranunculus glacialis are 
entirely missing in America, whereas Polemonium humile and Dryas 
octopetala are found there, even though there is so wide an expanse 
_ between their Ameircan and Greenland areas, as to make it impossible 
to think of any connection between them. Those 5 species may form a 
separate group E, to which also Sawifraga hieraciifolia (Gr. II, 2) may 
be counted, as it shows a similar distribution, even if it is found in the 
Arctic Archipelago also. 
The 4 species of Group II, 3, show rather a curious distribution. 
Melandrium triflorum is one of the few endemic species of Greenland, 
and must of course go to Group G, where I have alternatively placed 
Taraxacum phymatocarpum. It is, however, reported also for Grin- 
