154 ALIEN FLORA OF BRITAIN 



Marrubium Alysson, L. Native of the Mediterranean 

 region. Once recorded in connection with many other 

 grain-sifting ahens near Oulton Broad in Norfolk. 



[Marrubiuin vulgare, L. A native of downs on 

 calcareous soil in England. Much grown in old times^ 

 and still grown to a smaller extent in cottage gardens^ 

 under the name of Horehound. It is now a frequent 

 naturalised weed by roadsides and waste ground.] 



Melissa officinalis, L. A native of woods in the 

 Mediterranean area. Much and long cultivated in 

 British cottage gardens, and sometimes occurring as 

 a garden escape. 



[Mentha alopecuroides, Hull. A rare plant in the 

 British Isles, and frequently under suspicion of being 

 a garden escape, the species being sometimes used 

 as a substitute for Mentha viridis. There can be little 

 doubt, however, that it is a true native in the eastern 

 counties.] 



[Mentha arvensis, L. According to written records 

 it is almost confined to cultivated and waste ground 

 in England. It is certainly native, however, in damp 

 meadows and by river sides, though much less common 

 in these than in artificial situations.] 



[Mentha piperita, L. The commonly cultivated Pep- 

 permint. A frequent escape from cultivation. It is 

 confidently recorded as a native in several English 

 counties, and there seems no external evidence to throw 

 doubt upon the statements.] 



