INTR OD UCTION xv 



Books, Herbaria, and MSS. consulted. 

 Nearly the whole of the information contained in this 

 book was collected in the magnificent Herbarium and 

 Library of Kew. The work could hardly have been 

 done in any less completely equipped establishment, for 

 it has been necessary to obtain details of the native area 

 of British plants over the greater part of Europe and 

 Western Asia, and the existing compilations upon the 

 subject afforded little help. In them no discrimination 

 is attempted between the truly native area and the area 

 over which the plants are wild. Reference has therefore 

 been necessary to individual foreign local Floras in order 

 to ascertain the exact habitats and status of each species. 



Books. 



It would serve no useful purpose to enumerate the 

 many hundreds of British and foreign local Floras and 

 periodicals consulted, but the following works which 

 have been of especial use may be mentioned : — 



A. de Candolle, Geographic Botanique. 



H. C. Watson, Cybele Britannica. 



Journal of Botany. 



Reports of the Botanical Exchange Club. 



Public Herbaria. 



Kew Herbarium. All the writer's identifications for the 

 Flora were made there. Much information has been 

 obtained from the Herbarium labels respecting regions 

 of which no published botanical records are available. 

 The Borrer and Watson Herbaria at Kew were con- 

 sulted for records, 



British Museum Herbariimi. The British section was 

 carefully gone through and a large number of records 

 noted for the list. 



Individual Collections. 



(i) A collection of seventy-six species of aliens found 

 at Oulton Broad, Suffolk, from 1 898-1902 by Mrs. Baker, 

 of Oulton Broad. 



(2) Thirty-four species found by Mr. Eraser Robinson 

 near Hull Docks in 1901. 



