172 6. CISTACE.E. 



Hancock, for " a single specimen " of the present species ; 

 but some eiTor is to be feared. I presume that the highest 

 locaUty is the " summit of Cronkley Fell," on the Yorkshire 

 side of the Tees ; the exact altitude of that locality being 

 unknown to me : it Is estimated at 2000 feet. 



130. Helianthemum polifolium, Hook. "^ >v^^. 



■J-^^_ 



Area 1 ^ * * [5]. 



South limit in Devon. 



North limit in Somerset. 



Estimate of provinces 1. Estimate of counties 2. 



Latitude 50 — 52. Local type of distribution. 



Agrarian region. Inferagrarian zone. 



Descends nearly to the coast level in Devon. 



Ascends to a trifling elevation only ? Z/"*-**^/^- ■^ /-fr^^u^J-. 



Range of mean annual temperatme 51 — 50. 



Native. Rupestral ? Two localities only are on record for 

 this rare species ; namely, cliffs at Babbicombe and Tor- 

 quay, on the south-east coast of Devon (Flora Devoniensis) , 

 and Brean — not, Brent — Down, on the coast of Somerset 

 (Su- W. C. Trevelyan, sp.). I do not know the heights of 

 these localities. 



Helianthemum ledifolium, Willd. 



Ai-ea [1]. 



Incognit. Hudson records this from sandy pastures and 

 meadows, near Brean Down, Somersetshire ; but possibly 

 some error had occurred between this and the preceding 

 species. The Rev. J. C. Collins has sought the alleged lo- 

 cahty, year after year, unsuccesfully. 



