The Botany of Iceland - 01.12.1914, Síða 126

310
THORODDSEN
borealis, Alsine biflora, Cerastium trigynum, Saxifraga Hirculus1. In
Sydri Pollar (729 metres) I collected in the same year the fol-
lowing plants: — Equisetum variegatum, E. arvense, Carex rigida,
C. lagopina, C. rariflora, C. pulla, Juncus arcticus, J. biglumis, Erio-
phorum Scheuchzeri, E. angustifolium, Poa alpina, P. flexuosa, Phleum
alpinum, Aira alpina, Festuca rubra var. arenaria, Calamagrostis stricta
f. borecdis, Salix glauca, S. lanata, S.herbacea, S. phylicifolia, Betula
nana, Polygonum viviparum, Rumex acetosa, Arenaria ciliata, Cera-
stium alpinum, Silene acaulis, Cardamine pratensis, Tofieldia borealis,
Montia rivularis, Thalictrum alpinum, Pinguicula vulgaris, Armeria
maritima, Saxifraga decipiens, S. Hirculus, Pedicularis flammea, Eri-
geron uniflorus, Thymus serpyllum var. prostrata, Veronica alpina,
Dryas octopetala, Vaccinium uliginosum, Empetrum nigrum, Bartsia
alpina2. As already mentioned, on Tvidægra there are extensive
stretches of bog-land and a considerable vegetation of various spe-
cies. In 1898 I collected here, nearUlfsvatn (453 melres), the fol-
lowing plants: — Juncus biglumis, J. triglumis, J. trifidus, Luzula
spicata, Eriophorum angustifolium, E. Scheuchzeri, Carex alpina, C.
atrata, C. dioeca, C. lagopina, C. pulla, C. rigida, C. sparsiflora, Aira
cœspilosa, A. flexuosa, Anthoxanthum odoratum, Festuca ovina, F. rubra,
Phleum atpinum, Poa atpina. P. glauca, Trisetum subspicatum, Coelo-
glossum viride, Salix glauca, S. herbacea, Polygonum viviparum, Alsine
verna, Cerastium alpinum, C. trigynum, Silene acaulis, Viscaria alpina,
Ranunculns acer, Thalictrum alpinum, Cardamine pratensis, Draba
incana, Geranium silvaticum, Saxifraga cœspitosa, S. Hirculus, S. stel-
laris, Potentilla verna, Alchimilla vulgaris f. filicaulis, Sibbaldia pro-
bens, Vaccinium uliginosum, Bartsia alpina, Pinguicula vulgaris, Thy-
mus serpyllnm var. prostrala, Gentiana nivalis, G. lenella, Galium sil-
vestre, Hieracium alpinum, Taraxacum lœvigatum. In the same year I
collected near Hval vatn (378 metres) the following species: — Juncus
triglumis, J. trifidus, Eriophorum angustifolium, Carex chordorrhiza,
C. dioeca, C. Goodenoughii, C. lagopina, C. pulta, C. rariflora, C. rigida,
Aira cœspitosa, A. flexuosa, Anthoxanthnm odoratum, Festuca ovina,
Phlenm alpinum, Poa glauca, Tofieldia borealis, Loiseleuria procnmbens.
South of the great Jökulls the vegetation generally extends fur-
ther upwards on the plateau than to the north of them, but here
also there are vast deserts of gravel, lava and blown sand, with a
few widely separated oases, but it is especially the tracts between
1 Determined by O. Gelert.
2 Determined by O. Gelert.