WITH ALTITUDE. 73 



" Species above ^OQOfeet. — Aira alpina, Carex rigida, 

 Empetrum nigrum (very rarely), Festuca ovina, Gna- 

 phalium supinum, Juncus trifidus, Leontodon palustre, 

 Luzula arcuata, L. spicata, Oxyria reniformis, Ruraex 

 Acetosa, Salix herbacea, Saxifraga stellaris, Sibbaldia pro- 

 cumbens, Silene acaulis, Vaccinium Myrtillus, Viola pa- 

 lustris. The absence of soil, rather than the height, 

 probably arrests others. To these 17, we may add 6 

 others seen on the very summit of Ben-Lawers, which is 

 said to be 4015 feet above the sea ; viz. Cherleria sedoides, 

 Cerastium alpinum, Polygonum viviparum, Saxifraga op- 

 positifolia, S. nivalis, Saussurea alpina. Total 23. 



" Species between 3000 and 4000 feet. — Achillea 

 Millefolium, Aira flexuosa, Alchemilla alpina, A. vulgaris, 

 Anthoxanthum odoratum, Apargia Taraxaci, Arabis pe- 

 trssa, Arenaria rubella, Azalea procumbens, Calluna vul- 

 garis (rare, and never to 3500 feet), Caltha palustris, 

 Campanula rotundifolia, Cardamine hirsuta, C. pratensis, 

 Carex dioica, C. panicea, C. pilulifera, C. pulla, Ceras- 

 tium latifolium, C. viscosum, Chrysosplenium alterni- 

 folium, C. oppositifolium, Cochlearia officinalis, Draba 

 rupestris, Eleocharis csespitosa, Epilobium alpinum, Erio- 

 phorum angustifolium, Euphrasia officinalis, Galium 

 saxatile, Juncus biglumis, J. triglumis, Myosotis alpestris, 

 Nardus stricta, Narthecium ossifragum, Oxalis Acetosella, 

 Poa alpina, P. annua, Ranunculus acris, Rhodiola rosea, 

 Rubus Chamaemorus, Salix reticulata, Saxifraga cernua, 

 S. hypnoides, S. rivularis, Silene maritima, Statice Ar- 

 meria, Stellaria cerastoides, S. uliginosa, Thalictrum 

 alpinum, Thymus serpyllum, Tormentilla officinalis, Tri- 

 folium repens, Tussilago Farfara, Vaccinium uliginosum, 

 V. Vitis-Ideea, Veronica alpina, V. serpyllifolia. In all 

 57 species. To these may be added the 23 former, all of 

 which (except Luzula arcuata) I have seen below 4000 feet 

 L. arcuata, in Sutherland, must be below this, if not be- 

 low 3000 feet. Total, 80 species. 



£ 



