178 50. GENTIANACEiE. 



Descends to the coast level, in Channel province. 



Ascends to 50 or 100 yards, in England. 



Range of mean annual temperature 50 — 48. 



Native. Lacustral. In addition to the six counties 

 mentioned above, the Villarsia occurs wild in Surrey, Ox- 

 ford, Bucks, Middlesex, Essex, and Huntingdon. It is 

 also reported in Packington Park, in Warwickshire, and in 

 the lake at Welbeck, in Nottinghamshire ; to both of 

 which, I should suspect, it may have been introduced. 

 Besides these counties, it is recorded for Stafford, Lancas- 

 ter, York, Northumberland, Westmoreland, Cumberland 

 (falsehood ?), Lanark, Berwick, and Perth ; to all of which 

 it has doubtless been introduced, if (with reference parti- 

 cularly to Cumberland) found there at all. 



727. Menvanthes trifoliata, 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. 



A. A. regions. Inferagrarian — Inferarctic zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 600 yards, in province of Lakes. 



Range of mean annual temperature 52 — 41. 



Native. Uliginal, Paludal. Possibly the full comital 

 census of 82 may be rather too high for this plant. My 

 notes afford authorities for its existence in sixty counties, 

 and I cannot select any one among the remaining twenty- 

 two, which may be deemed more likely to be destitute of 

 the Menyanthes than to produce it. I have seen it above 

 500, but not up to 600 yards, in the Scottish Highlands. 



