70. URTICACE.B. 369 



979. Urtica dioica, Linn. 



9 



Area general. 



South limit in Cornwall, Isle of Wight, Kent. 



North limit in Shetland, Orkney, Hebrides. 



Estimate of provinces 18. Estimate of counties 82. 



Latitude 50 — 61. British type of distribution. 



A. A. regions. Inferagrarian — Midarctic zone. 



Descends to the coast level, in the Peninsula. 



Ascends to 800 yards, in the East Highlands. 



Range of mean annual temperature 52 — 39. 



Native. Viatical, Septal, &c. Abundantly common 

 throughout Britain, the two upper zones excepted, and, 

 perhaps, the Hebrides also, where it appears to have been 

 observed only in one spot, by Balfour and Babington. I 

 have only once met with it above 2000 feet of elevation ; 

 namely, under a great overhanging rock on the Breadal- 

 bane mountains, calculated at 2500 feet of elevation, and 

 evidently much resorted to by sheep for the sake of its 

 shelter. Here grew the Urtica dioica and Stellaria media, 

 with some other low country weeds, probably conveyed to 

 this spot by the sheep. The Urtica dioica is frequent 

 about houses, sheep-pens, and imder stone walls, at 500 

 or 600 yards of elevation in Scotland. 



980. Urtica pilulifera, Linn. 



Area (12 34567*9* 11). 



Alien. Though long an inhabitant of England, whether 

 by human introduction or otherwise, this species would 

 seem to have very little tendency to diffuse itself over ex- 



VOL. II. 2 B 



