BRITISH PLANT LISTS AND THEIR DISCREPANCIES 235 



naturalised in Cornwall and elsewhere), Cainpamda Rapun- 

 adoides, Pidnionaria officinalis (native or naturalised in Essex 

 and Oxon), Euphorbia Cyparissias (thought by Babington to 

 be native at Whitbarrow, while E. diilcis is included), Pinus 

 Pinaster^ etc. 



Rosa viUosa, L., is given in the Vienna rules as an 

 instance of a specific name which has been used in such 

 varying ways as to be doubtfully applicable to any one 

 species (I do not, however, entirely concur in this) ; it is 

 however retained in the " Seed-Plant List." 



To come to the two more recent lists, namely my own 

 " List of British Plants," published in January, and the tenth 

 edition of the " London Catalogue," issued in February of 

 this year under the editorship of the Rev. E. S. Marshall 

 and Mr. W. A. Clarke, one may acknowledge the existence 

 of some important differences, the first being that I have 

 endeavoured to follow the law of priority of publication, and 

 to reject the Vienna list of noniina consei'vanda, when the 

 name does not follow that law. I have explained this more 

 fully in the preface, and it is a plan which is adopted by a 

 large and increasingly influential number of botanists. The 

 second point of difference is that while I have included a 

 great number of aliens, often quite of a fugitive character, the 

 "London Catalogue" professes to include those only which are 

 more or less established. There is much to be said for and 

 against either method. This is not the time for me to make 

 a special plea for my own plan. I may say, however, that 

 I first intended to keep the indigenous and introduced plants 

 in separate parts, but the difficulties that arose were consider- 

 able, and I thought a truer idea of Systematic Botany would 

 be obtained by keeping them in proper sequence in one list ; 

 but I think its consecutive numbering to be a mistake, since 

 additions are sure to be numerous, although for Exchange 

 Club purposes consecutive numbers have advantages. 



The rejection of the nomina conseyvanda of the Vienna 

 laws is responsible for the following discrepancies in the two 

 lists so far as the genera are concerned, and I have given 

 dates of the establishment of these genera in order to show 

 how inconsistent and unfair are the Vienna rules ; the 

 second column being the novmia conservanda. Those with 



