453 NATURALIZED PLANTS OF GREAT BRITAIN. \June, 



Claytonia perfoliata. Ly&imachia ciliata. 



Erigeron canadense. Mimulus luteus. 



Antennaria margaritacea. Anacharis Alsinastrum. 



Senebiera didyma is supposed to have spread from the sea-port 

 towns of the south-west of England, since, if a native, it was too 

 distinct in character to have escaped mention by English botanists 

 until the year 1778, when Hudson first described it under the 

 name of Lepidium anglicum. 



Oxalis cornicidata is thought to have reached Europe since the 

 sixteenth century, but it is not certain that it may not be in- 

 digenous to Asia as well as America. 



I. The other 73 Naturalized Plants are European species ; of 

 these, 23 are not found wild nor even well established in those 

 parts of the Continent which lie nearest to England ; geogra- 

 phical reasons therefore render it almost impossible for any of 

 them to have reached Britain except through the agency of man. 



Arahis turrita, H. & A. Astrantia majoi*. 



])iantlm8 plumarius. Myrrhis odorata, B., L. C. 



Silene italica, L. C Louicera Caprifolimn. 



Lonicera Xylosteum, B., Bromf. Acanthus mollis. 



Asperula taurina. Rumex alpinus. 



Valeriana pyrenaica. Iris tuberosa. 



Nardosmia fragrans. ^ Iris xipbioides. 



Senecio sqnalidus. Crocus vernus, \ -r e 



Petasites albus. Lilium Martagon, J 



Hieraeium aurantiacum. Allium Ampeloprasmn. 



Cyclamen hedercefolimii, B. Allium ambiguum. 

 Linaria pvirpurea. 



Three, viz. Arabis turrita, Lonicera Caprifolium and Senecio 

 squalidus, are traced to the botanic gardens of Cambridge and 

 Oxford, and most of the others have been much cultivated. 

 Hieraeium aurantiacum, Astrantia major, Petasites albus, and 

 Rumex alpinus may have been brought with alpine seeds from 

 Switzerland. Only 4, viz. Dianthus plumarius, Myrrhis odo- 

 rata, Senecio squalidus, and Crocus vernus, have reached Ireland. 



It will be seen that 5 out of the above list have one or more 

 advocates in favour of their indigenous origin in Britain, viz : — 



Arabis turrita, which does not occur in Holland nor in the 

 north of France, its station nearest to England being on the 

 Vosges mountains, 



of our authors treat them as natives : L. C, referring to the ' London Catalogue,' 

 5th Edition ; B. to the 4th edition of ' Babington's Manual ;' H. & A. to Hooker 

 and Arnott's ' British Flora.' 



