34. CRASSULACEiE. 399 



Descends to the coast level, in the Peninsula. 



Ascends to (neai-ly) 1100 yards, in North Wales. 



Range of mean annual temperature 52—38. 



Native. Rupestral. It may at first appear incorrect to 

 refer to the Atlantic type a species which is so nearly gen- 

 eral in its provincial area. Nevertheless this is truly one 

 of the most remarkable examples of that type, with a slight 

 approximation towards the British also. It occurs in so 

 many localities along the western coasts of England and 

 Scotland, and often in such profusion, as to be one of the 

 more common plants there. But when our attention is di- 

 rected to the eastern coasts, we find a very striking differ- 

 ence ; for then it ranks at once among the rare plants. It 

 has been reported from Kent, Suffolk and Norfolk (one or 

 both), Northumberland, Fife, Forfar, and Elgin ; but in all 

 these counties only very locally. In the inland counties it 

 is scarcely found at all. Thus, notwithstanding its oc- 

 casional appearance on the east side of the island, it is pre- 

 eminently a plant of western distribution ; and in this re- 

 spect it associates with the Cotyledon Umbilicus and 

 Pinguicula lusitanica, plants remarkable for their western 

 tendency, without being absolutely restricted to the western 

 provinces. 



413. Sedum album, Linn. -^^ ^^- ^^^ ./<. ^"^^ 

 413,b. Sedum turgidum, '■'■ Ramr 



Area (1 2 3 4 5 [6] 7 8 * 10 11 [12] * * 15). 



Alien ? Similar reasons with those mentioned under S. 

 dasyphyllum, induce me to place the present species also 

 in the alien category. On looking over the localities 

 which I have compiled together, only two exceptions can 

 be made to the presumption of an alien origin. In the 



