154 46. ERICACE^. 



the most westerly part of the East-Highland province ; and 

 the latter peculiarity contrasts strongly against the diffusion 

 of the species throughout Scandinavia, as indicated by 

 Fries. It is, in fact, a plant of Middle Britain. Winch 

 says that it occurs in the North of England, from 250 to 

 2000 feet above the sea. But he gives no locality in his 

 Flora of Northumberland and Durham, or in his Contribu- 

 tions to Cumberland, which can justify any such altitude as 

 2000 feet. 



700. Arbutus alpina, Linn. 



Area j)f*^^*^jjf^jj4^*j^^*15 16 17 18. 



South limit in Forfar, West-Inverness (Nevis and Skye). 



North limit in Shetland, Orkney, Sutherland. 



Estimate of provinces 4. Estimate of counties 7. 



Latitude 56 — 61. Highland type of distribution. 



A. A. regions. Superagrarian — Superarctic zones. 



Descends to the coast level, in North Highlands. 



Ascends to 900 yards, in same province. 



Range of mean annual temperature 46 — 36. 



Native. Ericetal. To the five counties above mentioned 

 the inteiTuediate Moray and Ross may be added. It is now 

 supposed that the alleged habitat in the Isle of Mull ought 

 to have been given for the other and more frequent species. 

 Descends but slightly within the agrarian region. 



701. Arbutus Uva-Ursi, Limi. 



Area * * * * [5 * * 8 9] 10 11 12 * 14 15 16 17 18. 

 South limit in York, Westmoreland, Cumberland. 

 North limit in Shetland, Orkney, Caithness. 



