Botanical Excursions into the Highlands. 359 



A little higher we have 



Rubus Chamaemorus. Cornus Suecica. 



Betula nana. Arbutus alpina. 



Epilobium alpinum. Draba incana. 



Bordering closely on the confines of Carex rigida, are 



Juncus trifidus. Gnaphalium supinum. 



Arabis petraea. Hieracium alpinum. 



Above the commencement of Carex rigida, we first see 



Sibbaldia procumbens. Poa alpina. 



Cerastium alpinum. Salix herbacea. 



Aira alpina. Astragalus alpinus. 



Here, too, is the natural climate of some species occasionally 

 carried lower by streams or debris from rocks, viz. 



Veronica alpina. Phleum alpinum. 



saxatilis. Sonchus alpinus ? * 



Carex atrata. Saxifraga nivalis. 



Vahlii. Cherleria sedoides. 



Alopecurus alpinus. Spergula saginoides. 



Stellaria cerastoides and Saxifraga rivularis are scarcely seen 

 below ihe upper limit of Calluna vulgaris; and Luzula arcuata 

 on Ben-na-muic-dui only commences a thousand feet above this. 



With respect to the upper limits of species. On the small 

 space of Ben-na-muic-dui rising above Empetrum nigrum vf eve 

 only observed 



Luzula spicata. Carex rigida. 



arcuata. Festuca vivipara ? 



Silene acaulis. Lycopodium Selago. 

 Salix herbacea. 



These constitute the vegetation of the summit ; and, very near- 

 ly as high, were 



Vaccinium Myrtillus. Juncus trifidus. 



Aira alpina. Viola palustris. 



Gnaphalium supinum. 



Excepting Luzula arcuata, all these were seen above Empe- 

 trum nigrum on the Ben Nevis range (in which Cairn Garidh 

 is included), and, along with them, several others, which per- 

 haps may exist equally high on Ben-na-muic-dui, viz. 



• Mr Watson marks this with doubt, from being necessarily ignorant of 

 the elevations of the new stations at which Sonchus alpinus was found. Nei- 

 ther can I speak positively, but my impression is as he states it. All the 

 new stations are, like the old one, in deep shaded ravines, with a northern 

 aspect.— 11. G. 



