Manchester Memoirs, Vol. Hi, (1908), No, 15. 



XV. An Annotated List of the Alien Plants of the 

 Warrington District. 



By G. A. DUNLOP. 



Received and read March 24th, igo8. 



The Warrington District may be defined as the area 

 included within a radius of ten miles from Warrington 

 Bridge. 



During the last few years the number of adventitious 

 plants has been increasing to such an extent that it is 

 desirable that some record should be made of their 

 stations and habitats, and, where possible, of their origin, 

 while the data are still fresh. 



As many of these aliens depend for their introduction 

 upon commercial, industrial, and domestic operations, the 

 means of introduction may be summarised as follows : — 



1. The construction of the Manchester Ship Canal, 



1 887- 1 894; and the opening of the same to 

 traffic from all parts of the world. 



2. During the last twelve months the railway between 



Warrington and Acton Grange High Level 

 Bridge has been doubled, and many plants 

 entirely new to the local flora have been intro- 

 duced in the imported soil used in making the 

 new embankments. 



3. In two comparatively small areas, quite an alien 



flora has sprung up owing to the use of corn 

 siftings for feeding poultry. 



luly 22nd, igo8. 



