Rit (Vísindafélag Íslendinga) - 01.06.1975, Side 66

and rivulets there grow C. rostrata and Menyanthes trifohata.
Analyses 5-7 are from a flói outside the main wet tract, where
there is much less red clay, and some parts are slightly drier.
Analysis 5, however, is made on very wet terrain near a pond
covered with a C. rostrata sociation. The species of the sociation
are few. G percentage is very high and HH percentage quite high
in many parts. In two analyses there is a significant percentage
of Ch, but they were made closer to a tract of heath than the others.
f. Carex rariflora flói — Caricétum rarifloræ
Carex rariflora is one of the most common flói plants throughout
the country both in lowland and highland districts. It is a char-
acter species together with E. angustifolimn, Carex rostrata and
Carex Lyngbyei in many sociations, and it is present more or less
in all those flói sociations which are described here, except for a
few instances involving the C. Lyngbyei flói. On the other hand
it is seldom dominant enough to characterize the vegetation. This
is in part because it is the smallest of these species and it disap-
pears among them. At times, however, it becomes dominant in
places which are within the confines of the other sociations. Tliis
C. rariflora flói then most closely resembles the C. chordorrhiza
flói. A pure C. rariflora flói, however, I have not seen except at a
considerable altitude, so that I expect that it is rather associated
with higher lying places. Those flói sociations where C. rariflora
is dominant are usually very wet, but the C. rariflora association
itself occurs in very different areas with respect to moisture con-
tent, even in those areas which dry up for the better part during
the summer. The C. rariflora flói is always level and without any
gradient. There is abundant moss with surprisingly continuous
cover except where the wettest parts occur. According to several
observations it is primarily Drepanocladus which accompanies the
C. rariflora flói. Related vegetation associations are the Caricétum
rarifloræ in Greenland (Bocher 1933 pp. 104-105), which is held
to testify to oceanic climate, and the Paludella squarrosarich rari-
flora association, which Nordhagen describes in Sylene (Nord-
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