1 66 ALIEN FLORA OF BRITAIN 



it occurs in England and Belgium in woods and bushy 

 places (especially as the variety Pseudo-dumetorum), 

 there seems no good reason to exclude it from our 

 native list.] 



Polygonum corrigioloides, Jaub and Spach. Re- 

 corded as a grain introduction in one or two localities. 

 Native of Persia. 



[Polygonum lapathifolium, L. A native in marshes 

 and on river banks in England, but in the great majority 

 of Floras mentioned only as a weed of cultivated and 

 waste ground,] 



[Polygonum Persicaria, L. The same remarks apply 

 to this species as to P. lapathifolium. The plant is 

 common in natural habitats.] 



Humex alpinus, L. A native of grassy places in the 

 mountains of Southern Europe. Formerly cultivated 

 in Britain for its roots, which were apparently used 

 medicinally. It is now occasionally found in waste 

 ground about villages. 



[Rumex crispus, L. A very common weed of road- 

 sides, field-borders, and other waste ground ; also not 

 uncommon in natural habitats such as seashores, glades 

 in woods, and naturally broken ground, though seldom 

 so recorded.] 



Kumex dentatus, L. A weed of cultivated fields from 

 the Eastern Mediterranean area to Northern India. 

 Occasionally recorded in England as a grain intro- 

 duction. 



