200 HORTICULTURIST'S RULE-BOOK. 



6. RULES FOR BOTANICAL NOMENCLATURE ADOPTED BY THE 

 BOTANICAL CLUB OF THE AMERICAN ASSOCIATION FOR THE 

 ADVANCEMENT OF SCIENCE. 



(Combined Rules of Rochester and Madison Meetings.) 



The Paris Code of 1867 is adopted except where it conflicts 

 with the following : 



The Law of Priority. Priority of publication is to be re- 

 garded as the fundamental principle of botanical nomen- 

 clature. 



Beginning of Botanical Nomenclature. The botanical 

 nomenclature of both genera and species is to begin with the 

 publication of the first edition of Linnaeus' " Species Planta- 

 rum," in 1753. 



Stability of Specific Names. In the transfer of a species to 

 a genus other than the one under which it was first published, 

 the original specific name is to be retained. 



Precedence of Publication. In determining the name of a 

 genus or species to which two or more names have been given 

 by an author in the same volume, or on the same page of a 

 volume, precedence shall decide. 



Homonyms. The publication of a generic name or a 

 binomial invalidates the use of the same name for any subse- 

 quently published genus or species respectively. 



Publication of Genera. Publication of a genus consists 

 only (1) in the distribution of a printed description of the 

 genus named ; (2) in the publication of the name of the genus 

 and the citation of one or more previously published species as 

 examples of types of the genus, with or without diagnosis. 



Publication of Species. Publication of a species consists 

 only (1) in the distribution of a printed description of the 

 species named ; (2) in the publishing of a binomial with refer- 

 ence to a previously published species as a type. 



Similar Generic Names. Similar generic names are not to 

 be rejected on account of slight differences, except in the spell- 

 ing of the same word ; for example, Apios and Apium are to be 



