68. EMPETRACE.E. 355 



959. Aristolochia Clematitis, Linn. 



Area (1*345**8). 



Alien. Generally allowed to be only an introduced 

 plant in Britain. It has existed many years in some few 

 places near old gardens, chiefly those connected with re- 

 ligious edifices. 



960. Empetrum nigrum, 'Linn. 



Area'i [2] * * 5 6 7 8 9 10 11 12 13 14 15 16 17 18. 



South limit in Monmouth, Warwick, Leicester. 

 «^^&-»W' North limit in Orkney, Hebrides, Caithness. 



Estimate of provinces 14. Estimate of counties 50. 



Latitude 51 — 60. Scottish type of distribution. 



A. A. regions. Midagrarian — Superarctic zones. 



Descends to the coast level, in Scotland. 



Ascends to 1300 yards, in East Highlands. 



Range of mean annual temperature 47 — 34. 



Native. Ericetal. Possibly there may have been a pe- 

 riod when the provincial distribution of this little shrub 

 might have been entered as " general," although it is now 

 tt. unknown in the first four provinces, and rare in the fifth. 



Mr. Boner has no doubt respecting its former existence in 

 Sussex, where it is now no longer found. I think Sir 

 Walter Trevelyan informed me that it had occurred in 

 Somerset, but I cannot find the memorandum to this effect, 

 and therefore omit the first province in the line of area. 

 For the provinces of Thames and Ouse I have no autho- 

 rity, ancient or otherwise. I am unprepared to state the 

 most southern province in which the Empetrum descends 



