234 1'2. CARYOPHYLLACE^. 



low Heath, and about Boston in Lincolnshire. It was un- 

 successfully sought in the latter place, by Sir Joseph 

 Banks, who thought that Bupleurum tenuissimum had 

 been mistaken for it. Perhaps the Moenchia erecta was 

 thus mistaken on Hounslow Heath. 



198. Cherleria sedoides, Linn. 



Area ^^^^^^^^^^^^^^\b\Q 17 18. 



South limit in Stirlingshire and Perthshire. 



North limit in Shetland and Sutherland. 



Estimate of provinces 4. Estimate of counties 8. 



Latitude 56 — 61. Highland type of distribution. 



Arctic region. Midarctic — Superavctic zones. 



Descends to 850 yards, in East Highlands. 



Ascends to 1300 yards, in same province. 



Range of mean annual temperature 38 — 34. 



Native. Rupestral. A very alpine and local plant, 

 though certainly found in the north of Sutherland at a 

 lower elevation than here indicated ; and unless there is 

 some error in respect of its occurrence in Shetland, it must 

 be found very much lower on Haroldswick and Ronas hills, 

 in those islands. On the faith of its existence in Shetland, 

 the range of temperature might be extended to 40 degrees, 

 or higher. Though I should not have anticipated the oc- 

 currence of this plant in Shetland, it seems not sufficiently 

 unlikely, to warrant the rejection of Mr. Edmondston's au- 

 thority for it — somewhat hasty, as I know him to have 

 been, in his nomenclature of plants. 



