52 ALIEN FLORA OF BRITAIN 



been found in a similar state in many other parts 

 of England, doubtless in each case originating fronfi 

 gardens. 



[Impatiens Noli-me-tangere, L. Indicated as a native 

 in Northern Wales and in Cumberland, as on the 

 neighbouring parts of the Continent. In most of its 

 localities in Britain it is treated by local botanists as an 

 introduced plant.] 



Impatiens parviflora, DC. A native of mountain 

 woods in Siberia, which has become plentifully naturalised 

 in various parts of Europe. It was not known in 

 England before the year 185 1, when it was discovered 

 by Mr. Irvine at Battersea. It had made its appearance 

 twenty years earlier in the Botanic Gardens of Geneva. 

 The records, indeed, suggest horticultural trade as the 

 cause of its distribution. When once introduced its 

 spread has been remarkably rapid in numerous English 

 localities. 



Impatiens Roylei, Walp. Rather a favourite cottage- 

 garden plant in some parts of England, which has 

 appeared in a semi-naturalised state in several localities. 

 It is a native of the Himalaya region. Mr. Britten has 

 summarised its history as an English plant in Journal of 

 Botany y 1899, p. 50. 



Limnanthes Douglasii, R. Br. A native of North 

 America which has been found once or twice as an 

 escape from cultivation in Britain. 



Oxalis eorniculata, L. An abundant weed in most 

 of the warmer parts of the world, being probably native 



