296 58. PRlA>ULACEiE. 



884. TRIENTAUS EUROPiEA, Zi««. -^ /^--^^.^^^ 



Area ********* 10 1 1 12 * 14 15 16 17 18. 



South limit in York, North Lancashire. 



North limit in Shetland, Ross, Aberdeen. 



Estimate of provinces 8. Estimate of counties 20. 



Latitude 53 — 61. Scottish type of distribution. 



A. A. regions. Superagrarian — Midarctic zones. 



Descends below 50 yards, in East Highlands. 



Ascends to 900 or 950 yards, in same province. 



Range of mean annual temperature 46 — 37. 



Native. Ericetal. The locality in Edinburghshire, and 

 perhaps some of the others, may bring this plant within the 

 limit of the midagrarian zone. Is it wholly absent from the 

 West Lowland counties .? 



885. HoTTONiA PALUSTRis, Linn. 



Area 12345*789 10 11 12** [15]. 



South limit in Dorset, Hants, Sussex, Kent. 



North limit in Westmoreland, Durham. 



Estimate of provmces 12. Estimate of counties 40. 



Latitude 50 — 55. English type of distribution. 



Agrarian region. Inferagi-arian — Midagrarian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 50 or 100 yards, in England. 



Native. Lacustral. Apparently very local in the West- 

 ern counties, being still unrecorded from Cornwall, Devon, 

 South Wales, and the adjacent counties of North Wales 

 and the Severn province. The only habitat recorded in 

 Scotland, that of CaiTeston, Forfarshire, cannot be trusted ; 



