UPON THE FLORA OF THE SHETLAND ISLES. 13 
Feroes and the Shetlands, yet the former presents upon its mountain- 
sides all the gradations from a north temperate clime to an arctic one. 
This will account for the greater predominance of boreal species in the 
Feroes, the flora of which is certainly an appendix to the Icelandic 
group; whilst that of the Shetlands appertains to the Scottish flora. 
The flora of Feroe numbers 292 species, 198 of which form part of 
the Shetland vegetation ; of these— 
1. Appertaining neither to an arctic nor to an alpine-boreal type of 
vegetation. The following are common to Feroe and Orkney, and are 
certainly desiderata to the Shetland list. These are :—Nasturtium 
officinale, Oxalis Acetosella, Geum rivale, Epilobium tetragonum, Myrio- 
phyllum verticillatum ?, Hieracium Pilosella, H. murorum, Galeopsis 
Ladanum, Salix caprea, Potamogeton pusillus, Scirpus fluitans, Lastrea 
Filix-mas, Cystopteris fragilis, Asplenium Trichomanes. 
2. Appertaining to an alpine-boreal type. The following, also 
common to the Orkneys and Feroes, are not so decidedly desiderata to 
the Shetland list. These are :—-Draba verna, Geranium sylvaticum, 
Dryas octopetala, Saxifraga hypnoides, Pinguicula alpina, Oxyria re- 
niformis, Salix arbuscula, S. glauca. Further :— 
3. Appertaining neither to an arctic nor to an alpine-boreal type. 
The following are absent in the Shetlands and Orkneys, and are cer- 
tainly desiderata to the lists of these two botanical districts. These 
are:—Ranunculus auricomus, Cardamine amara, C. impatiens, Coch- 
learia Anglica, Brassica campestris, Hypericum dubium, Geranium pra- 
lense (probably native in Shetland), Potentilla verna, Epilobium roseum, 
Ceratophyllum demersum, Carduus acanthoides, Apargia Tarazvaci, Vac- 
cinum Vitis-Idea, Pyrola minor, Myosotis palustris, Limosella aquatica, 
Mentha arvensis, Orchis Morio, Scirpus maritimus, Eleocharis acicularis, 
E. pauciflorus, Carex pallescens, C. stricta, C. acuta, C. riparia, Lemna 
polyrrhiza, Isoetes lacustris, Equisetum hyemale. 
Then again there are those— 
4. Which are alpme-boreal, existing at the same time in boreal Eu- 
rope and on the Scottish mountains and the Swiss Alps, but not known 
in Orkney and Shetland, as Draba rupestris, Cerastium alpinum, 
C. trigynum, Epilobium alpinum, Alchemilla conjuncta, Sedum villosum, 
Saxifraga stellaris, S. nivalis, S. rivularis, S. cespitosa, Cornus succisa, 
Hieracium alpinum, H. Lawsoni, Bartsia alpina, Veronica alpina, F. 
sazalilis, Salix lanata, Juncus trifidus, J. biglumis, Luzula spicata, 
