Xll PREFACE. 



by Gray, and subsequently increased to forty-eight I 1 In Crypto- 

 gams, as well as in flowering plants, the number of species has been 

 exaggerated ; far so, indeed, beyond the requirements of science. 



A list of authorities consulted in this compilation is added to the 

 other lists ; it has not been deemed advisable to look into any of 

 earlier date than the 'New Botanist's Guide' of 1834. Actual 

 occurrence in the present, and not the local history of plants in the 

 past, is what has been aimed at, however imperfectly that object 

 may have been attained. 



For lists of Aliens, Casuals, Extinctions, and other excluded 

 species, the reader is referred to the ' London Catalogue.' 



1 See remarks, Endlicher, * Genera Plantarum.' 



