LABIATE 151 



nowhere known under natural conditions. Its very- 

 near ally, Ajuga Chia (differing only in the size of the 

 flowers and in degree of hairiness), is a native of the 

 south-eastern corner of the above region, and it is 

 possible that the former species may have originated 

 from the latter as a modification especially adapted 

 to agricultural conditions. 



Ajuga Iva, Schreb. A cornfield weed of Central 

 and Southern Europe and the East. A grain introduc- 

 tion in England. 



Ballota nigra, L. A native of the Mediterranean 

 region and Western Asia. In England and most of 

 Europe it is a weed of hedges and waste places, 

 showing a preference for the neighbourhood of human 

 habitations. 



Calamiutha graveolens, Benth. A casual in several 

 situations near cornmills, or where the sittings of corn 

 have been thrown. 



Elsholtzia cristata, Willd. A weed of cultivation 

 in Northern Continental Europe which has been noticed 

 as a casual in waste ground near London. 



[Galeopsis Ladanum, L. A native of dry stony places 

 in the greater part of Southern Europe, becoming more 

 rare in this condition northwards, and only found as 

 an obvious native in Britain on shingles, and in a few 

 other such places in Southern England. It is, however^ 

 common in cultivated fields both here and on the 

 Continent.] 



