38. UMBELLIFER.E. 423 



tain of Cheviot, and in the Hole of Horcum, in the east of 

 Yorkshire. It is thus a striking exception to ahnost all the 

 other examples of the Highland type. Such of them as 

 occur also in England, bemg found on the higher moun- 

 tains of the Lake province and North Wales, or those in 

 the West of Yorkshire and Durham. The mean tempera- 

 tm"e of the Yorkshire locality is probably several degrees 

 above 42°, and the altitude lower than 300 yards ; but 1 

 find no clear infoiTBation on these points, and therefore 

 the altitude and temperature are indicated from the Scot- 

 tish distribution. 



441. Hydrocotyle vulgaris, Linn. 



Area, general. 



South limit in Cornwall, Isle of Wight, Kent. 



North limit in Shetland, Orkney, Hebrides. 



Estimate of proAinces 18. Estimate of counties 82. 



Latitude 50 — 61. British type of distribution. 



Agi-arian region. Inferagraiian — Superagi'aidan zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 350 or 400 yards, in the Lake province. 



Range of mean annual temperature 52 — 44. 



Native. Uliginal. Perhaps this plant may be rare 

 among the Highland momitains ; although frequent in the 

 low gi'ounds of those and other provinces. But with re- 

 gard to a plant so easily overlooked, the non-appearance of 

 its name among my notes on the altitudes of plants in the 

 Highlands, is not conclusive evidence against its being 

 there. As it is said to be common ui Shetland, we might 

 anticipate its occuiTence to some hundreds of yaids of ele- 

 vation in the Highlands. 



