348 24. ROSACEA. 



POTENTILLA TRIDENTATA, Liufl. -^ /^- ^^- ^ . ^/y_ 



Area [15]. 



Incognit. The late Mr. G. Don appeared quite confi- 

 dent that he had seen or collected this species in Forfar- 

 shire ; and there is even a specimen preserved in Smith's 

 herbarium, which is labelled as though actually collected 

 on the mountain of Werron, in that comity, by Mr. Don, 

 with the date of April 3, 1809. Is it possible that Mr. 

 Don could have mistaken plants of Sibbaldia procumbens 

 or Potentilla Fragaiiastrum for this species, and have sent 

 or pointed out to Smith an example of P. tiidentata as 

 being the same species as that which he had seen on Wer- 

 ron and other hills ? I do very much suspect that this is the 

 true solution of some of the mystery or uncertainty which 

 attaches to several of Mr. Don's habitats ; namely, that, 

 intending to send or show the same species, he or Smith 

 inadvertently confused it with some other species. 



334. Potentilla Comarum, Scop. 



Area, general. 



South limit in Cornwall, Isle of Wight, Sussex. 



North limit in Shetland, Orkney, Hebrides. 



Estimate of provinces 18. Estimate of counties 70. 



Latitude 50 — 61. British type of distribution. 



A. A. regions. Inferagrarian — Midarctic zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 850 or 900 yards, in the East Highlands. 



Range of mean annual temperature 50 — 38. 



Native. Uliginal. Much less fiequent than most other 



