8 ALIEN FLORA OF BRITAIN 



occurrence in natural woods in England, leaves ap- 

 parently no logical ground for rejecting the species 

 as a native of Britain.] 



Epimedium alpinum, L. Native of alpine pastures 

 in North America, Siberia, and Eastern Europe. It is 

 much cultivated and has become naturalised near culti- 

 vation in France, Germany, Belgium, and England. 



PAPAVERACE^. 



Argeiuone mexicana, L. A cosmopolitan weed, 

 probably Central American in origin. It has occurred 

 a few times in England about quays and ballast heaps. 



Chelidonium majus, L. Native in shady mountain 

 woods in the east of Europe, and common in artificial 

 surroundings about villages to the north and west as far 

 as Britain. That its native range once included England 

 is indicated by Mr. Clement Reid's discovery of its seeds 

 preserved with other plant-remains in interglacial deposits 

 in Sussex. Thus it is prior to man in North-West 

 Europe, though not now known except in connection 

 with human habitations. 



Corydalis bulbosa, DC. Native of woods in Southern 

 and Central Europe. In England frequently reported as 

 naturalised near gardens. 



Corydalis lutea, DC. Native of rocky hills in Southern 

 Europe. Naturalised in many places in England on old 

 walls as the result of garden culture. 



