382 26. HALORAGIACE.E, 



Wales to the North Highlands or Isles. The localities on 

 record in books are few of them trustworthy. 



387. CERATOPHyLLUM DEMEKSUM, Linn. ^e. ^-^^ ^y/ '/ ,* . 



Area 1 2 3 4 5^ * sj * 11 ^ * 14 15. 



South limit in Devon, Hants, Sussex, Kent. 



North limit in Forfarshire and ? 



Estimate of provinces 12. Estimate of counties 40. 



Latitude 50 — 57. English (?) type of distribution. 



Agrarian region. Inferagrarian — Superagrarian zones. 



Descends to the coast level, in the Channel province. 



Ascends to 100 or 200 yards, in England. 



Range of mean annual temperature 50 — 47. 



Native. Lacustral. The two species of Ceratophyllum 

 are probably often overlooked ; and the provincial and 

 comital census are in consequence estimated considerably 

 above the numbers ascertained and recorded, in order to 

 balance the under-estimate which would be made by adher- 

 ing more closely to the actual amount of knowledge in re- 

 lation thereto. Looking at the provincial area, the type of 

 distribution would seem to be Germanic rather than British ; 

 but I am disposed to think that this is attributable to the 

 paucity and incompleteness of our lists of plants in the 

 westerly provinces. 



388. Ceratophyllum sdbmersum, Linn. ^ l^"- '^^.J^'V^ \ 



Area 4234|***j(.10***14. 



South limit in Sussex and Kent. 



North limit in Edinburghshire and Linlithgowshire. 



Estimate of provinces — ? Estimate of counties — ? 



