63. POLYGONACEvE. 337 



through much of Scandinavia, although failing to attain 

 Lapland. On the whole, therefore, there seems fair 

 gi'ounds for expecting a provincial and almost comital 

 generality in Britain. 



i^ /^. //5r ^, ^,^^ ggg Polygonum minus, Huds. 



Area 123456789 10 11* 13* [15]. 



South limit in Dorset, Isle of Wight, Sussex, Kent. 



North limit in Dumfries, Durham. 



Estimate of provinces 12. Estimate of counties 30. 



Latitude 50 — 55. English type of distribution. 



Agrarian region. Inferagrarian — Midagrarian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 100 or 200 yards, in England. 



Range of mean annual temperature 51 — 48. 



Native. Inundatal. Almost restricted to England, and 

 not at all common there ; although its inconspicuous ap- 

 pearance may cause it to be overlooked, and thus make it 

 seem less frequent than the reality. Don said that it was 

 to be found about Forfar ; but neither Mr. Gardiner nor 

 any other Scottish botanist has been able to verify the al- 

 leged habitat. Professor Balfour collected it in Dumfries ; 

 so that it does grow in Scotland, however locally. Not yet 

 discovered in Cornwall or Devon. Dr. Southby found it 

 in Somerset, and is, I believe, the only authority for this 

 species in the province of the Peninsula. 



939. Polygonum aviculare, Linn. 



Area general. 



South limit in Cornwall, Isle of Wight, Kent. 



VOL. II. z 



