350 63, POLYGON ACE^. 



Shee and Glen Clunie, where Salix herbacea and Sibbal- 

 dia procumbens grow on the open moor ; so that it may 

 be there deemed just within the midarctic zone. All ray 

 other notes indicate a lower altitude. Dr. Dickie assigns 

 it a range upward even to 3559 feet ; while to Rumex 

 acetosa he gives only an ascent to 1386 feet. 



953. OXYRIA EENIFOKMIS, Hook. ' 



Area * * * * [5] * 7 * * 10 * 12 * * 15 16 17 18. 



South limit in Merioneth, Caernarvon, York. 



North limit in Orkney, Hebrides, ? 



Estimate of provinces 7. Estimate of counties 20. 



Latitude 52 — 60. Highland type of distribution. 



A. A. regions. Superagi'arian — Superarctic zones. 



Descends to the coast level, in the East Highlands. 



Ascends to 1300 yards, in the same province. 



Range of mean annual temperature 47 — 33. 



Native. Rupestral. Although the Oxyria descends 

 along the course of the river Dee even to the city of Aber- 

 deen, on the coast. Dr. Dickie thinks that its lowest natural 

 limit, except as carried lower down by water, in that 

 county, is at Ballater, about 900 feet above the sea, and 

 forty-four miles inland. But from the moderate elevation 

 (500 or 600 feet?) to which it descends in Cumberland 

 and Caernarvon, it would seem to be naturally adapted to 

 the coast level, in the West Highlands. I have seen it on 

 a rock by the road-side, between Pitmain and Dalwhinnie, 

 on the northern side of the Grampians, at an altitude sup- 

 posed to be 800 feet ; and it descends to the bed of the 

 stream in Glen Clova, on the southern declivity of the 

 Grampians, probably between 800 and 900 feet of elevation. 



