PREFACE. XI 



too numerous to mention individually, who have been ever 

 ready to help us with information and by the loan of 

 specimens and books, and this assistance we gratefully 

 acknowledge. We are especially indebted to Mr. F. J. 

 Hanbury for placing his own and the Boswell herbarium 

 entirely at our service, to Mr. Arthur Bennett for his fre- 

 quent help with specimens and notes, to Mr. J". Britten and 

 Mr. "VV. P. Hiern for valuable advice and assistance especi- 

 ally in matters of nomenclature, to Mr. E. G. Baker and 

 Dr. Eendle for kind help in referring to books and specimens 

 at the Natural History Museum, to Messrs. A. Fryer and 

 F. Townsend for assistance with Potamogeton and Euphrasia 

 respectively, and to Messrs. Colgan and Scully for kindly 

 furnishing us with a list of additions to the Irish Flora. 



H. & J. CT. 



London, May 1904. 



