The Botany of Iceland - 01.12.1930, Page 63
STUDIES ON THE VEGETATION OF ICELAND
53
Table 12 b.
Biological Spectra of the Valllendi Vegetation.
1 2 3 4 5 6
Points sum 672 684 680 668 736 652
Number of species 19 21 15 16 15 17
Density of species 6.7 6.8 6.8 6.7 7.4 6.5
A .. . 38.7 33.3 15.9 14.4 17.4 9.2
E . . . 61.3 66.7 84.1 85.6 82.6 90.8
A 3 18.5 16.4 15.9 13.2 17.4 8.0
A 2 0.6 0.6 » » » »
A 1 19.6 16.4 » 1.2 » 1.2
E 4 23.2 21.6 15.3 15.6 16.8 20.2
E 3 13.7 15.8 22.4 24.6 21.2 16.0
E 2. 24.4 27.5 45.3 37.7 44.0 52.1
El. ... » 1.8 1.2 7.8 n 5 2.5
Ch ... . 29.2 21.1 » 1.8 0.5 0.6
H ... 46.4 58.5 81.2 86.8 72.3 81.6
G .. 20.2 20.5 18.8 11.4 27.2 17 8
HH » » > > » »
Th ... 4.2 » » » » »
diíTerence between this type, the jaðar vegetation, on the one hand,
and the nio and mýri vegetations on the other hand, to set it up
as a type of the same standing as these. Much would seeni to in-
dicate that this is the case. Thus it is a faetor of some importance
fhat it appears as a very characteristic feature of the landscape in
the highland tracts. Deschampsia cœspitosa, Poa pratensis, and Agrostis
tenais are characteristic species on jaðar soil. Types of Icelandic
vegetation included herein are valllendi, tún, and mýri jaðar. The
very remarkable ílag vegetation is always associated with it, but
owing to very divergent physiognomical, biological, and tloristic pe-
culiarities it must be set up as a special type of vegetation.
On Lýngdalsheiði the jaðar vegetation was represented by vall-
lendi and mýri jaðar.
The Valllendi Vegetation. Cf. fig. 8 and table 12 A—B.
On the numerous small flat cones deposited by the streams of
'uelting snow, occurring partly in Lýngdalur and partly scattered
"bout throughout the heath, a characteristic vegetation, the valllendi