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APPENDIX. [ Botany of Terra Australis. 
The greater number of Australian genera, except the Acotyledonous, 
diiFer from those of Europe ; there are, however, a few European genera, 
as Utricularia, Drosera, and Samolus, that appear to have even their 
maximum in Terra Australis. 
From the following list of species, common to Terra Australis and 
Europe, I have carefully excluded all such, as though now existing in the 
different Settlements, have evidently, or probably, been introduced, and 
I am satisfied that no naturalized plant will be found in it except, perhaps, 
Cynodon Dactylon. 
I have also excluded certain plants, as Elatine Hydropiper, Geum 
urbanum, Oxalis corniculata, Lycopus europseus, and Typha angustifolia, 
which, though appearing to differ in some respects from those of Europe, 
are probably not specifically distinct. Aud if among the Phmnogamous 
plants inserted there be any room for doubt respecting the identity of the 
Australian and European species, it may possibly be as to Arenaria 
marina, Zapania nodiflora, Atriplex Halimus, Potamogeton gramineum, 
Cyperus rotundas, and IIolcus grylftfs. 
The first observation that occurs with regard to this list is, that the 
relative proportions of the three primary divisions of plants compared with 
those of the Australian Flora are inverted: for of 2900 Dicotyledories of 
the Flora only 15 are natives of Europe ; while of 860 Monocotyledones 
30, and of 400 Acotyledones upwards of 120 appear in the list. 
The Phaenogamous plants of the list are, with very few exceptions, 
also natives of North America, and several of them are found even in other 
parts of the world. 
There is nothing peculiar in the apparent structure or ceeonomy of 
the Dicotyledonous plants common to countries so remote to account for 
their more general diffusion: though several of them grow in wet or 
marshy ground, yet very few are properly aquatic plants ; and in the struc- 
ture of their seeds the only circumstance in which they all agree is in the 
plurnuJa of their embryo not being evolved. 
Of the Monocotyledones , on the other hand, a considerable number 
are aquatic plants ; and the greater part of those that are not aquatic 
belong to the irregular tribes, supposed to have a simpler structure. 
Among the Acotyledonous or Cryptogamous orders it is remarkable 
