1 8 ALIEN FLORA OF BRITAIN 



Carrichtera Vella, DC. A native of the dry hills of 

 the Mediterranean region which is said to be common 

 as a weed of cultivated fields in many parts of Europe 

 and Western Asia. It is only as a grain-sifting introduc- 

 tion that it has been recorded in England. 



Cheiranthus Cheiri, L. The Wallflower is indigenous 

 among rocks in the Mediterranean region. In the rest 

 of Europe, including Britain, it is naturalised on walls, 

 in quarries and on cliffs in the neighbourhood of houses, 

 as a result of its general and long-continued cultivation 

 in gardens. 



Chorispora syriaca, Boiss. This weed of the Syrian 

 deserts, and of cultivated and waste ground in their 

 neighbourhood, has once been recorded as a grain 

 introduction in England. 



Chorispora tenella, DC. Has also been recorded once 

 under similar conditions. It is a native of the Caspian 

 region. 



Conringia austriaca, Sweet. A native of dry stony 

 hills in East Central Europe, and becoming a cornfield 

 weed there. Once recorded in England. Probably a 

 grain introduction. 



Conringia orientalis, L. A common cornfield weed 

 in Europe, especially on calcareous soils. In Britain 

 rarely in cultivated ground, frequently among grain- 

 sifting aliens on waste ground. 



Crambe orientalis, L. A native of rocky ground in 

 Asia Minor and Persia. It has once been recorded in 



