24. ROSACE.E. 347 



North limit in Ross-shu-e, Aberdeenshire, Renfrewshire. 



Estimate of provinces 17. Estimate of counties 75, 



Latitude 50 — 58. British type of distribution. 



A. A. regions. Inferagi'arian — Inferaictic zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 700 yards, in North Wales. 



Range of mean annual temperatm-e 51 — 40. 



Native. Sylvestral and Septal. Frequent or common 

 in England ; becoming infi-equent or rare in the Highland 

 provinces. Tliis latter circmnstance is rather remarkable, 

 because the plant is seen occasionally at a liigh elevation. 

 Even in Glen Beg, in the north of Perthshire, it was ob- 

 served at 2000 feet of elevation ; which, in a naiTow moun- 

 tain pass, is almost within the midarctic zone ; and, indeed, 

 the Sibbaldia and this Potentilla were growing at about the 

 same elevation in the pass ; though the Sibbaldia is rarely 

 seen within the inferai-ctic zone, except where it descends 

 along the course of a stream, which is not the case in the 

 pass from Glen Beg to Glen Clmiie. 



Potentilla alba, Limi. 



Area [7]. 



Incognit. Su])posed to have been brought from Wales ; 

 but not having been verified as a native of that part of 

 England, we seem to be wan-anted in" presuming that 

 P. Fragariastrum or some other plant was mistaken for 

 this one. 



