436 BICKNELL: FERNS AND 
And it is pertinent here to note that no northward maritime plant 
of New Jersey is not also a plant of Nantucket, for with the in- 
land species the case is different. 
Turning again to Dr. Stone’s admirable and enlightening 
analysis of the flora of southern New Jersey, wherein is much.that 
now enables us better to understand the flora of Nantucket, we 
find a list of fifty-nine species that range south to New Jersey 
from the Canadian Maritime Provinces. Forty-one of these 
plants belong to the Nantucket flora. Of the eighteen that are not 
found there, ten are also wanting on Long Island and most of 
the others are all but absent there. And only three of these 
eighteen plants have been found on Martha’s Vineyard. These 
species are the following: 
Lycopodium inundatum Carex limosa 
Schizaea pusilla Salix lucida 
Scheuchzeria palustris Dalibarda repens 
Phalaris arundinacea Geum strictum 
Panicularia obtusa Hypericum ellipticum 
Scirpus subterminalis ~ Ascyron 
Carex trichocarpa Polanisia graveolens 
*  extlis Aster nemoralis 
“ livida Xanthium commune 
It is to be noted of these plants whose course has taken them 
to southern New Jersey, while withholding them from the re- 
lated floras of Nantucket, Martha’s Vineyard and Long Island, 
that with few exceptions they are of pronounced general northern 
range. At their eastern limits they approach the seaboard at 
a relatively high latitude, most of them ranging westward and 
bearing south as elevation of land or favoring conditions may 
allow. Their approach to the New Jersey littoral would thus 
appear to have been by an inland route by way of the Alleghanian 
highlands that cross the Hudson and the northwestern part of 
that state. From their places of abundance to the northeast 
the drift of their range westward and southward has passed to 
the north of southeastern Massachusetts and borne them on their 
highway along the hills whence, at a lower latitude, they have 
found access to the region of the Coastal Plain. All this the evi- 
dence would seem to allow us to believe. 

