30 LAWS OF NOMENCLATUEE. 



tion as to its chai'acters, cannot be considered as being 

 published. The same may be said of a genus an- 

 nounced without being characterized. 



Art. 47. Botanists will do well to conform to the 

 following recommendations : — 



(1.) To give accurately the date of publication of 

 their works or portions of works, and that of the sale 

 or the distribution of named and numbered plants. 



(2.) To publish no name without clearly indicating 

 whether it is that of an Order or of a tribe, of a genus 

 or of a section, of a species or of a variety, — in short, 

 without giving an opinion as to the nature of the 

 group to which the name is given. 



(3.) To avoid publishing or mentioning in their 

 works unpublished names which they themselves do 

 not accept, especially if the authors of such names 

 have not expressly authorized them to do so. (See 

 Art. 36, 6.) 



Section 4. 



On the Precision to he given to Names by the Quotation of the 

 Author who first published them. 



Art. 48. For the indication of the name or names 

 of any group to be accurate and complete, it is neces- 

 sary to quote the author who first published the 

 name or combination of names in question. 



Art. 49. An alteration of the constituent characters, 

 or of the circumscription of a group, does not warrant 

 the quotation of another author than the one that first 

 published the name or combination of names. 



"When the alteration is considerable, the words : 

 mutatis charaet., or pro parte, or excl. syn., excl. sp., 

 excl. var., or any other abridged indication, are added 



