16. HYPERICACEiE. 253 



Estimate of provinces 13. Estimate of counties 40. 



Latitude 50 — 60. Atlantic (?) type of distribution. 



Agrarian region. Inferagi'arian — Superagrarian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 300 or 350 yards, in North Wales. 



Range of mean annual temperatiue 52 — 45. 



Native. Uliginal. Intel-mediate by its distribution, be- 

 tween the British and Atlantic types. Its apparent ab- 

 sence from the provinces of Trent, Tyne, East Lowlands 

 and East Highlands, though so uniformly distributed up 

 the western provinces, gives an Atlantic character to its 

 area and prevalence ; while, on the other hand, several lo- 

 calities in the province of Ouse, in connexion with the al- 

 leged one at Guisborough, in the north-east of Yorkshire, 

 show too much of an eastern or Germanic tendency. And 

 when we find it recorded so far north as Orkney, on the 

 authority of Dr. Neill, it is made to appear a species of the 

 south and north, of the west and east, — and thus one of 

 the British type as nearly as aught else. Mr. Bowman 

 obseiTed it at 1000 yards of altitude in North Wales; 

 and I think it was seen by myself rather higher on Dart- 

 moor, in Devon. 



234. Hypericum calycinum, Linn. 



Area (12 3456***** 12 13). 



Alien. Introduced into the British Isles ; but being a 

 plant which holds the ground well by its creeping suckers, 

 it wiU gi-ow and spread freely in places where it is left mi- 

 disturbed, after being once introduced. As it diffuses 

 itself very little, if at all, by seed, it can scarce be deemed 

 a naturalized species. 



