334 63. POLYGONACE.E. 



Descends to the coast level, in the Peninsula. 



Ascends to 100 or 200 yards, in England. 



Range of mean annual temperature 52 — 45. 



Native. Lacustral. I do not remember ever meeting 

 with this species above 100 yards of elevation, even in 

 England ; and yet its northward range into Shetland, Lap- 

 land and Finland, might lead us to expect its occurrence 

 at 300 or 400 yards in England, if not also in the High- 

 land valleys of 200 or 300 yards of elevation. 



934. Polygonum Persicaeia, Linn. 



Area general. 



South limit in Cornwall, Isle of Wight, Kent. 



North limit in Shetland, Orkney, Hebrides, 



Estimate of provinces 18. Estimate of counties 82. 



Latitude 50 — 61. British type of distribution. 



Agrarian region. Inferagrarian — Superagrarian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 450 yards, in East Highlands (Dickie). 



Range of mean annual temperature 52 — 42. 



Native. Agrestal, Inundatal. I have not seen this 

 higher than 300 yards in the Highlands, and therefore 

 quote Dr. Dickie for the greater elevation ; as is also done 

 in several other instances, where, without the information 

 borrowed from that able observer of Nature, I might have 

 given the altitudinal ranges of the plants on too restricted 

 a scale. It is much to be desired that Dr. Dickie would 

 continue his examination of the altitudinal ranges of plants 

 while his re^dfefice Yemains so conveniently near to the 

 line of the Grampian Mountains. 



