a \ . = 
62 Cincinnati Society of Natural History. 
s 
in but one place in this country, viz: at Wells, Maine, in a salt marsh.* 
Carex fulva has been found but once (at Tewksbury, Mass.) in the 
United States,t though it grows in Newfoundland, and is scarcely known ~ - 
north of latitude 60 deg. in Europe.t Carex extensa has also been 
found in but one locality in America, viz: on the coast of Long Island, 
on the border of a salt marsh.§ Carex paludosa is only known from 
the border ofa salt marsh at Dorchester, Massachusetts, and is per- 
haps naturalized from Europe. We have here, then, five species which 
are confined to one locality each, and all have been found under such 
circumstances as to justify the belief that they have been introduced 
by some agency, since the advent of man in America, and are not 
properly native. 
Drosera longifolia does not grow north of latitude 47 deg. in 
America ; but as it has not been found in Lapland, we may assume 
this to be a casein which the species is not capable of living now in 
high latitudes, though it may have done so when the climate was milder. 
This is the case, also, with the following, none of them growing to the 
north of 48 deg. latitude in America, nor of 55 deg. in Europe. 4 
Myriophyllum verticillatum. Naias flexilis 
Zannichellia palustris. Ruppia maritima. 
Vallisneria spiralis. Potamogeten compressus. 
Typha angustifolia. Potamogeten obtusifolius (?). 
-Naias major. Carex riparia. 
Samolus valerandi, of Europe, is represented in America by the 
variety americana ; and as this does not extend north of latitude 
50 deg. in United States, nor the species above 55 deg. in Europe,** we 
may understand that the variety flourishes here as the representa- 
tive of the other form. With Potamogeten pusillus, var. vulgaris, 
‘though the species grows in high latitudes in both Europe and 
America, the variety does not. The variety halli, of Scirpus supinus, 
is the eastern form, produced probably by climatic or other changes, 
for the true form is found in Texas.tt The two remaining species, 
Spartina juncea, and S. stricta are both found in salt marshes, or on 
sea beaches. Gray says: ‘‘ The two species of Spartina belong proper- 
* Gray’s Manual, p. 578. + Ibid, p. 594. 
t Gray, Am. Jour. Sci., 2dseries, vol. xxiii., p.67. Watson in Geog. Dist. Plants, p. 252, 
says 55° instead of 60°. 
§ Gray’s Manual, p. 594. || Ibid, p. 596. 
{ See Watson, Geog. Dist. of Brit. Plants, Appendix II. Also, Gray, Am. Jour. Sci., 
vol. xxiili., pp. 67, 68. 
-* Wiatson, UaresmeDeicoos t+ Gray’s Manual, p. 563. 
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