124 ALIEN FLORA OF BRITAIN 



of Europe, in which region it also becomes a cornfield 

 weed. It has been noticed many times in connection 

 with grain introduction in England. 



[Senecio viscosus, L. A native of Europe, reaching 

 the woods of Normandy and Belgium. In England 

 it is very common as a weed of waste ground, but 

 it is also averred to be native of shingles and sand- 

 hills in many parts of our coasts, and, considering its 

 foreign distribution, there is no reason to doubt this.] 



[Senecio vulgaris, L. This species is so universal in 

 all temperate parts of the world, as a weed of cultivated 

 and waste ground, that it is impossible to say where 

 it may have existed before the advent of man. It 

 would, however, be equally impossible to prove that 

 it is not aboriginal and indigenous on ground naturally 

 broken by wild animals and on river banks, in both 

 of which situations it is a characteristic plant in 

 Britain.] 



Silybum Marianxuu, Gaertn. A native of the Medi- 

 terranean region and the East. In other parts of 

 Europe, including England, it is only known as a weed 

 of waste ground. Its dissemination has doubtless been 

 greatly accelerated by garden culture. 



SolidagO lanceolata, L. A native of marshes on the 

 prairies of North America. Cultivated in gardens and 

 occasionally recorded as an escape. 



Sonchus arvensis, L. It is very doubtful whether the 

 type of this species has ever been found in natural 

 habitats. It has certainly never been recorded so in 



