236 55. LAMIACE^. 



Agrarian region. Inferagrarian — Midagrarian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 100 or 200 yards, in England. 



Range of mean annual temperature 52 — 47. 



Native. Inundatal, Pratal, &c. Difficult to say where 

 this species is truly indigenous, and where it has become 

 established through the agency of mankind. Nor is this 

 difficulty the only impediment in the way of making out 

 the distribution of the plant ; for there seems much reason 

 to suspect that the names of M. sylvestris and M. rotundi- 

 folia have been frequently crossed and misapplied. Thus, 

 in the first edition of Babington's Manual, we find the Isle 

 of Arran indicated as the habitat for a variety, " \'elutina," 

 of M. rotundifolia ; but in the second edition, the variety 

 and habitat are transferred to M. sylvestris. And I have 

 myself occasionally been in doubt whether to refer certain 

 siDecimens to this or to the other species. To which spe- 

 cies does the " M. rotundifolia" of Winch (Flora N. D. and 

 Contrib. Cumberland) really belong .? If to M. sylvestris, 

 then the area, census, &c. of the present species must be 

 coritracted within limits to correspond with the necessary 

 correction. 



803. Mentha SYLVESTRIS, Zm?e. -^ ^^^^f £ /:^^a 



Area 1 2 3 4 5 6 7 8 * 10 * 12 * 14 15 16. 

 South limit in Cornwall .'' Dorset, Sussex, Kent. 

 North limit in Moray t Forfar } Perth .? Argyle ? 

 Estimate of provinces 13. Estimate of counties 30. 

 Latitude 50 — 56 (58). English type of distribution. 

 Agrarian region. Inferagrarian — Superagi-arian zones. 

 Descends to the coast level, in the Peninsula. 

 Ascends to 100 or 200 yards, in England. 

 Range of mean annual temperature 51 — 46. 



