322 Mr Watson''s Observations on the Temperature 



lanceolata, P. major, P. maritima, Poa fluitans, P. trivialis, Polygonum avi- 

 Gulare, P. Convolvulus, Populus tremula, Potentilla anserina, P. Fragarias- 

 trum, Primula vulgaris (probably higher), Prunella vulgaris, Prunus Padus, 

 Pyrethnun inodorum, Pyrola media, Ranunculus Auricomus, R. repens, llo- 

 sa spinosisshna, R. tomentosa, R. villosa, Rubus Idseus, Rumex crispus, R. 

 obtusifolius, Salix Andersoniana, S. fusca (some other willows), Senecio aqua- 

 licus, S. sylvaticus, Sinapis arvensis, Sonchus oleraceus, Spergula arvensis, 

 Spiraea Ulmaria, Stellaria media, Subularia aquatica, Teucrium Scorodonia, 

 Trifolium medium, T. pratense, Triodia decumbens, Ulex europseus (intro- 

 duced), Urtica urens, Valeriana officinalis, Veronica arvensis, V. Chamaedrys, 

 V. officinalis, V. scutellata, Vicia Cracca, V. sepium, Viola tricolor. To 

 these 120, we may add all the previous 186 species, except Aira alpina, Alo- 

 pecurus alpinus, Apargia Taraxaci, Arenaria rubella. Astragalus alpinus, 

 Carex atrata, C. puUa, C. rariflora, C. Vahlii, Cerastium alpinum, C. latifo- 

 lium, Cherleria sedoides, Draba rupestris, Erigeron alpinus, Gnaphalium su- 

 pinum, Juncus biglumus, J. castaneus, Luzula arcuata, Myosotis alpestris, 

 Oxytropis campestris, Phleum alpinum, Poa alpina, Salix lanata, S. reticu- 

 lata, Saxifraga cernua, S. rivularis, Sesleria coerulea, Sibbaldia procumbens, 

 Sonchus alpinus, Spergula saginoides, Stellaria cerastoides, Veronica alpina, 

 and V. saxatilis, which I have not seen below 2000 feet, and it is not likely 

 that any of them will be found much below this height. Deducting 33 

 from 306, we have 273 species left. Probably several others will here- 

 after be added to them. 



Species below 1000 feet. These it will be tedious to enumerate : and they may 

 be almost as readily shewn by the negative evidence. Besides the species al- 

 ready mentioned as not occurring below gOOO or 3000 feet ; the following seem 

 to reach their lower limits above 1000 feet. Arabis petraea. Azalea procum- 

 bens, Betula nana, Carex rigida, Epilobium alpinum, Hieracium alpinum, 

 Juncus trifidus (rare below 2000) J. triglumis, Luzula spicata, Potentilla 

 alpestris, Saussurea alpina, and Silene acaulis. A few others are observed be- 

 low 1000 feet in the north and west of Scotland ; but so soon as we quit the 

 Highlands they disappear from the low grounds. They are ; Alchemilla alpina, 

 Arbutus alpina, A. Uva-Ursi, Carex capillaris, Cornus suecica, Draba incana» 

 Dryas octopetala, Epilobium alsinifolium, Galium borealc, Meum athaman- 

 ticum, Oxyria reniformis, Pyrola secunda, Rubus Chamaemorus, Saxifraga 

 aizoides, S. stellaris, S. oppositifolia, Thalictrum alpinum, Tofieldia palus- 

 tris. 



Species of undetermined Height. — Besides what are enumerated in the pre- 

 vious lists, there are some other mountain plants which I have not seen 

 growing ; but which are most of them probably to be found between 2000 

 and 3000 feet. They are the extremely rare plants discovered by Mr 

 George Don, and one or two other botanists ; Ajuga alpina, Arabis ciliata, 

 Arenaria fastigiata, Bartsia alpina, Carex Mielichoferi, C. angustifolia, C. 

 stictocarpa, C. hordeiformis, C. ustulata, Elyna caricina, Eriophorum alpi- 

 num (said to grow on Ben Lawers) E. capitatum, Gentiana nivalis, Hiera- 

 cium cerinthoides, Hierochloe borealis, Lychnis alpina, Menziesia coerulea, 

 Poa laxa, Potentilla opaca, P. tridentata, Ranunculus alpestris, Salix (vari- 

 ous species), Saxifraga denudata, S. elongella, S. laetevirens, S. caespitosaj S. 



