The Flora of Disko Island and Adjacent Coast of West Greenland. 19 
Nomenclature. As I have but a limited access to literature 
here, especially to the older one, and none at all to any larger collec- 
tions, | am absolutely debarred from having any independent opinion 
as to the question of nomenclature. I have therefore largely made use 
of the nomenclature of the following works: 
1) C. H. Osrenre tp: Flora arctica I. 1902 (NB! published before 
the Vienna Rules of 1905). 
2) Diverse works by H.G.Stumons especially: The Vascular Plants 
in the Flora of Ellesmereland 1906. Flowerimg Plants and 
Ferns of North Western Greenland, 1909, and Survey of the 
Plytogeography of the Arctic American Archipelage 1915. 
3) B. L. Ropinson and M. L. Fernatp: Handbook of Flowering 
Plants and Ferns. (Gray’s new Manual 7th edition 1908). 
4) C. A.M. LinpmMan: Svensk Fanerogamflora Stockholm 1918. 
The distribution of the plants: This section is written by 
ErtinG Porsitp, revised and finally prepared for publication by M. P. 
Porsitp. Besides literature, our own collections and our excursion 
diaries have been resorted to, which especially contain information 
about the occurrence of the species common to the region concerned. 
As to rarer species we have mentioned the name of the finder, but in 
those cases when the species is fairly common we have omitted this 
and replaced it by our general indications of frequency. Our special 
aim has been to state, with greater accuracy than that used in LANGE’s 
Conspectus Fl. Grl., the character of the natural habitats of the plants. 
We have especially proceeded on the lines laid down by L. KoLtpERupP 
ROsENVINGE in ,,Andet Tilleg and by N. Harrz in ,,Fanerogamer og 
Karkryptogamer fra Nordostgronland™. 
The vertical distribution we have tried to express in general 
remarks, having dispensed with statements of the actual numbers in 
hand. In fact they seem to us still far too few and casual and 
hardly entitled to be published. Generally we think that a true 
arctic plant, what we in the following call a northern or widely 
distributed type, has no limit of elevation upwards, but on 
the other hand, it frequently has a limit of elevation downwards 
near the southern limit of its horizontal distribution, which, of 
course, does not prevent it from occurring occasionally below its 
continuous distribution, especially in places where fresh moraine ad- 
vances far down in the lowland, or where rivers and mountain streams 
may carry it right down to the coast. The absence of certain arctic 
species in the lowland are hardly due to climatic conditions, the cause 
being the competition between the species. 
Far otherwise the plants which we denote as southern types. 
o* 
