83. LEMNACE.E. 37 



1138. Lemna minoe, Linn. 



Ai-ea general. 



South limit in Cornwall, Isle of Wight, Kent. 



North limit in Orkney. 



Estimate of provinces 18. Estimate of counties 81. 



Latitude 50 — 60. British type of distribution. 



Agrarian region. Inferagrarian — Superagrarian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 100 or 200 yards, in England. 



Range of mean annual temperature 52 — 46. 



Native. Lacustral. Very general through Britain, un- 

 less some of the northern counties should he excepted. 

 Mr. Syme reports it as common in Orkney, and it is 

 marked in the list of British plants checked for the county 

 of Ross, and given to me by the Rev. George Gordon. 

 These are the only authorities that I am aware of, for the 

 two most northerly provinces; though it may likely 

 enough have been passed unobserved or unrecorded in 

 other parts of those provinces. Rev. G. Gordon indicates 

 it as frequent, though not among the most frequent, plants 

 of Moray. 



1139. Lemna gibba, Linn. 



Ai-ea 1 2 3 4 5 6 -* 8 9 10 * * * 14. 

 South limit in Devon, Isle of Wight, Kent. 

 North limit in Edinburgh ; — or York, Lancaster. 

 Estimate of provinces 10. Estimate of counties 40. 

 Latitude 50 — 56 (55). English type of distribution. 



