BftTANklCAU 



.ist of Pteridophyta and Spermatophyta o;rowing without 

 Cultivation in Northeastern North America. 



PREFACE. 



The following list of the Pteridophyta and Spermatophyta 

 of Northeastern North America, is an outcome of an extended 

 discussion of the principles of plant nomenclature in which most 

 American botanists have been participants at one time or anoth- 

 er, during the past ten years. The discussion of so complicated a 

 question has during that time brought out the widest differences 

 of opinion, but as it has proceeded these differences have be- 

 come fewer and fewer, so that now the general rules on which 

 the list has been compiled are in accordance with the views of the 

 great majority of North American students of systematic botany. 

 The matter was vigorously taken up by the botanists of the 

 American Association for the Advancement of Science at the 

 meeting of that organization, held at Rochester, New York, in 

 August, 1892, and after a very careful consideration of the topic 

 by a committee appointed for that purpose and a full discussion 

 of the report of that committee, the following resolutions were 

 adopted.* 



Resolved: That the Paris code of 1867 be adopted except 

 where it conflicts with the following : 



I. The Law of Priority. — Priority of publication is to be 

 regarded as the fundamental principle of botanical nomenclature. 



II. Beginning of Botanical Nomenclature.— The botan- 

 ical nomenclature of both genera and species is to begin with the 

 publication of the first edition of Linnzeus' " Species Plantarum," 



in 1753- 



III. 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, unless it is identical 



*See Bull. Torr. Bot. Club. 19: 290-292 and Bot. Caz. 17 : 287, 288. 



