71. AMENTIFER.?;. 379 



Ascends to 100 or 200 yards, in England. 



Range of mean animal temperature 50 — 48. 



Native. Sylvestral. Equally difficult as in the case of 

 the beech, to say where this tree is a genuine native and 

 where it exists only as an introduced species. Generally 

 allowed, I think, not to be indigenous in Scotland. Winch 

 says that it is not native in the north of England. In the 

 Floras of Yorkshire, Nottinghamshire, Anglesea, Stafford- 

 shire, Chaniwood, &c., it is included without negation, but 

 also without any satisfactory evidence in support of its real 

 nativity in those counties and tracts. It would seem to be 

 truly indigenous in the provinces of Thames and Ouse ; 

 quite possibly so in several others likewise. 



^'^*X 991. CORYI.US AVELLANA, Liiin. 



Area general. 



South limit in Cornwall, Isle of Wight, Kent. 



North limit in Orkney, Hebrides, Sutherland. 



Estimate of provinces 18. Estimate of counties 81, 



Latitude 50 — 60. British type of distribution. 



Agrarian region. Inferagi'arian — Superagrarian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 600 yards, in East Highlands. 



Range of mean annual temperature 52 — 42. 



Native. Sylvestral, Septal. Pleasant is it to pass on- 

 ward from the imperfectly distinguished species of Ulmus 

 and Quercus, and the imperfectly ascertained distribution 

 of Fagus and Carpinus, to a species which is so familiarly 

 known as the shrub now under notice. The Shetland Isles 

 would seem to offer the only exception to the generality of 

 its horizontal distribution in Britain. In vertical range it 

 rises occasionally above the actual limit of cultivation, on 



