xvi INTRODUCTION 



(3) About a hundred species found by the author at 

 Twerton, near Bath, in 1897. 



(i) Mr. Watson's MS. of the Cybele Britannica and 

 other of his notes preserved in the Botanical Department 

 of the British Museum. 



(2) Notes by the Rev. E. S. Marshall on Mr. S. T. 

 Dunn's Prelhninary List of the Alien Flora of Britain. 

 Mr. Marshall's notes have been of the greatest service 

 and have been freely used throughout. It is not the 

 first time that the author has had occasion to acknow- 

 ledge Mr. Marshall's kind and invaluable help. 



(3) Miscellaneous notes on British Aliens by Mr. A. 

 Smith, of Grimsby. Mr. Smith was himself engaged in 

 collecting materials for an Alien Flora of Britain. On 

 hearing, however, that one more fortunately situated than 

 himself for carrying out the work was engaged on the 

 same task, he, with rare generosity, placed his notes at 

 the author's disposal. 



(4) The Rev. E. A. Woodruffe-Peacock contributed 

 numerous notes. 



(5) Mr. I. H. Burkill contributed a London Catalogue 

 marked with additional aliens and other notes. 



Besides those mentioned above, my sincere thanks are 

 due for various acts of kindness in connection with my 

 work to Mr. A. O. Hume, Mr. A. Bennett, to Mr. Britten 

 and Mr. E. G. Baker at the Natural History Museum, 

 Mr. C. E. Salmon, Professor Trail, Mr. A. Somerville, 

 Professor Boulger, Mr. G. Nicholson, Mr. B. D. Jackson, 

 and Mr. Charles Bailey. 



Plan of the List. 



Natural Orders follow each other in the sequence of the 

 Genera Plantaniini. Genera and species are alphabetical. 



The nomenclature is that of the Index Kewensis. 



Besides aliens, certain species are referred to in 

 brackets whose exclusion from the list seemed to call 

 for explanation. 



