List of Pteridophyta and Spermatophyta growing 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 or Priority.—Priority of publication is to be 
regarded as the fundamental principle of botanical nomenclature. 
II. BEciNNING op BOTANICAL NOMENCLATURE.— The botan- 
ical nomenclature of both genera and species is to begin with the 
publication of the first edition of Linnzeus’ “Species eeleren ` d d 
in 1753. Te 
III. SrAniLITY OF Speciric 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. Gaz. 17: 287, 288. 
