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NOTES ON THE FLORA OF SOUTHERN FLORIDA. 451 
(136 woody, 83 perennial, and 28 monocarpic), of which 187 are 
common to the West Indian Islands and partly to South America 
and (31) to Mexico, 23 to Mexico only, and 37 known as yet only 
from Southern Florida. 
If it be conceded that the Gulf Stream is an insurmountable 
obstacle to immediate immigration from the West Indies, and that 
any plant from there must have made the circuit of the Gulf, why 
is it that the majority of these emigrants have not settled in 
Mexico, as should have been expected from the greater chances 
that evidently exist in favor of that country. The inference is 
reasonable that the 156 species of Southern Florida which are 
common only to regions lying southward and not to Mexico have 
for the most part not been transmitted by the waters of the Gulf, 
and that we must recur to other than the recent means of migra- 
tion. 
The flora of Northern Florida, including 58 widely distributed 
Species which are not expressly noted by Chapman as growing 
there, comprises 1511 species of vascular plants, of which 875 
occur in the Northern States. Of the remainder 234 extend to 
North Carolina, 113 to South Carolina, 108 to Georgia, 3 to Ten- 
nessee, and 53 only westward. Of all these only 15 are men- 
tioned expressly as occurring in Southern Florida. Of the 125 
which are known only from Florida 9 have been found in the 
Southern part of the State. There are 1487 Floridan species 
which are not known as belonging to Southern Florida, or which 
at least are not so reported in published documents. 
. It may further be remarked that the above 247 southern species 
belong to 170 genera, of which 102 with 131 species are not 
represented in Northern Florida, and of these again 26 genera 
with 30 species belong to orders which are not found in other 
parts of the eastern United States. Comparing, moreover, the 
woody, perennial and monocarpic species, we find the numbers 
quite disproportionate and must suspect that a great number of 
perennials, particularly Cyperaceæ and grasses in the interior are 
unknown. 
From all these facts we conclude that the flora of Southern 
Florida is, so far as known, not to be considered a part of the 
Heliotropium polys stachyum and Sarcostemma clausum; from Nuttall’s Sylva, Acacia 
es sepuas egga Cordia speciosa Pay orn a, and gene 
Pervifolia; and from Grisebach, Abutilon permolle, Desmodium tortuosum and Crinu 
m A t). 
