46. EBICACE.E. 147 



varieties. In short, however dissimilar in their extreme 

 forms, the two appear to pass gradually into each other 

 through a series of intermediate links. 



691. Erica ciliaris, Linn. 



Area 1 2 [3]. 



South limit in Cornwall. 



North limit in Dorset. 



Estimate of provinces 2. Estimate of counties 2. 



Latitude 50 — 51. Atlantic type of distribution. 



Agrarian region. Inferagrarian zone. 



Descends to the coast level, in the Peninsula. 



Ascends to 50 yards, more or less. 



Range of mean annual temperature 52 — 51. 



Native. Ericetal. Peculiar to the two counties above 

 mentioned, as far as hitherto ascertained ; having been first 

 introduced into the British Floras some twenty years ago, 

 when it was sent to Sir W. J. Hooker instead of E. vagans, 

 by the late Rev. J. Tozer, who had been applied to for the 

 latter, and consequently looked out for some Erica different 

 from Tetralix and cinerea. The localities in Cornwall are 

 variously described, but are all of them about Penryn, 

 Truro, and St. Agnes. The Dorset locality extends, ac- 

 cording to Dr. Salter, " throughout nearly the whole space 

 from Arne to Corfe, a distance of fully four miles." The 

 curiously intermediate links between this and E. Tetralix, 

 one of which is described by Bentham as a variety 

 (" Watsoni," DC. Prodr.) of E. ciliaris, are probably hybrid 

 varieties. At one end of the series, they are barely distin- 

 guishable from E. Tetralix, by the slightly larger and ven- 

 tricose corollas ; while, at the opposite extremity, they pass 

 into E. ciliaris almost imperceptibly. It is thus optional to 



L 2 



