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APPENDIX. [ Botany of Terra Australis . 
housese, both of them very small tribes, which many botanists may be dis- 
posed to consider rather as genera than separate families, 
A great part of the genera of Terra Australis are peculiar to it, and 
also a considerable number of the species of such of its genera as are 
found in other countries. 
Of the species at present composing its Flora scarcely more than 
400, or one-tenth of the whole number, have been observed in other 
parts of the world. More than half of these are Phtenogamous plants, of 
which the greater part are natives of India, and the islands of the southern 
Pacific ; several, however, are European plants, and a. few belong even to 
{equinoctial America. Of the Cryptogamous plants the far greater part 
are natives of Europe. 
In comparing very generally the Flora of the principal parallel of Terra 
Australis with that of South Africa, we find several natural families cha- 
racteristic of the Australian vegetation, as Proteaceae, Diosmeas, Restiacem 
Polygaleee, and also Buttneriaceae, ifFIermannia and Mahernia beconsidered 
as part of this order, existing, and in nearly equal abundance, at the 
Cape of Good Hope ; others are replaced by analogous families, as Epacri- 
deas by Ericese ; and some tribes which form a considerable part of the Aus- 
tralian peculiarities, as Diileniaceae, the leafless A cache and Eucalyptus, 
are entirely wanting in South Africa. 
On the other hand, several of the characteristic South African orders 
and extensive genera are nearly or entirely wanting in New Holland : thus 
Irideae, Mesembryanthemum, Pelargonium, and Oxalis, so abundant at the 
Cape of Good Hope, occur very sparingly in New Holland, where the 
South African genera Aloe, Stapelia, Cliffortia, Pcnsea, and Brunia, 
do not at all exist. Very few species are common to both countries, 
and of these the only one which is at the same time peculiar to the Southern 
hemisphere is Osmunda barbara. 
We have not sufficient materials for a satisfactory comparison of the 
Flora of the higher latitudes of South America with that of the Southern 
parts of Terra Australis. If, however, we may judge from those at pre- 
sent in our possession, it would seem that the general character of the 
South American vegetation differs much more from the Australian than 
this does from that of South Africa. Yet several instances occur of the 
