


PREFACE TO THE REVISED EDITION. 
THERE is perhaps no region of country whose Flora has been more 
carefully examined, and whose territory has been more thoroughly 
searched by botanists than the State of New Jersey. The reasons for 
this are, first, the Flora of the State is very prolific and remarkable ; 
second, the State is situated between the two great cities of the nation, 
which are the abodes of many learned and enthusiastic botanists. 
After the publication of the first edition of this Catalogue, it was 
ascertained that a number of plants growing in the State had been 
omitted, and some were included whose existence in the State is not sat- 
isfactorily established. It was also discovered that in some cases those 
marked rare should have been denoted frequent, and that others marked 
common were confined to more narrow limits than the author supposed. 
These defects have been corrected, and as far as possible all plants about 
which there is any doubt have been omitted. 
It was also thought that the value of the Catalogue would be greatly 
enhanced by indicating in some way the plants known not to be in- 
digenous. For this purpose the words used by Dr. Gray in his Manual 
are eminently suitable, and have been adopted here, and are explained 
under the head of Abbreviations. 
When Botanists noticed the marvelous change in the productiveness 
of the soil of the middle counties of the State, which immediately suc- 
ceeded the use of green sand as a fertilizer, it was predicted that with 
these altered conditions a new flora would appear. It would seem that 
we had a right to expect that some species would disappear to give place 
to others, whose conditions of growth would be especially provided for 
by this new fertilizer. In fact, we might reasonably expect the green 
sand region to have a peculiar flora. My observations, however, do not 
furnish me with any facts which justify such a conclusion. On the 
other hand, I am led to believe that the phosphates and soluble sili- 
cates contained in the marls, furnish materials for the growth and devel- 
opment which vegetation in general demands ; hence we find only a more 
