152 ALIEN FLORA OF BRITAIN 



Oaleopsis ochroleuca, Lam. A cornfield weed in the 

 east of England. It is recorded in natural habitats in 

 Belgium, but seems to be uncommon in Europe, except 

 as a weed. 



[Galeopsis Tetrahit, L. Native in England in 

 woods, but much more common as a weed of culti- 

 vated and waste ground, and usually recorded from 

 such localities.] 



Oaleopsis versicolor, Curt. Native of dry stony places 

 in Southern Europe. In Northern Europe, including 

 England, it is a cornfield weed. 



Hyssopus officinalis, L. An old garden plant in Eng- 

 land which has been found as an escape from cultivation. 

 Sometimes thoroughly naturalised. 



Lamiiun album, L. Native in woods and forests from 

 Spain and Morocco to Siberia and the Himalayas. Also 

 a weed about villages, roadsides, and waste places 

 throughout most of the North Temperate Zone. In 

 England it is a common plant in the latter kind of 

 situations. For a fuller discussion of the "Origin of 

 the Dead Nettles in Britain" see the Journal of Botany y 

 1902, p. 360. 



Lamium amplexicaule, L. It extends over the whole 

 North Temperate Zone of the Old World, including 

 England, but only as a weed of cultivated and waste 

 ground. It is nowhere recorded from native situations, 

 but may perhaps be an adaptation of Lamium macrodon 

 (a native of the cedar forests of Asia Minor) suited to 

 agricultural conditions. 



