20 ALIEN FLORA OF BRITAIN 



As, however, the species is a native only of dry hills 

 in Southern Spain, it is a most unlikely one to owe 

 its introduction to grain importation, and its presence 

 there, if the identification is correct, is not easy to explain. 



Erucaria aleppica, Gaertn. A weed of waste and 

 cultivated ground from Arabia to Greece. Once re- 

 corded as a grain introduction in England. 



Erysimum cheiranthoides, L. A weed of cultivated 

 and rubbishy ground in most of Europe. It is not 

 recorded from natural habitats in any part of its range. 

 In Britain it becomes rapidly rarer and less permanent 

 northwards. 



Erysimum hieracifolium, L. Mr. Woodruffe-Peacock 

 has recorded this Southern European weed as an alien 

 in two places in Lincolnshire. 



Erysimum perofskianum, Fisch. and Mey. A 

 native of Beluchistan and Afghanistan. Cultivated in 

 English gardens, and occasionally found as an escape 

 in their neighbourhood. 



Erysimum repandum, L. A weed of cultivated fields 

 in Central and South-East Europe. Recorded in several 

 places in England, usually on waste ground about the 

 big towns, where it may probably owe its presence to 

 foreign corn importation. 



Erysimum virgatum, Roth. A native of dry bushy 

 places in Central Europe, said by Babington in his 

 Flora of Bath to occur about that neighbourhood. 

 Presumably an alien there. 



