64 GENERAL REMARKS ON THE 



replaced by analogous families, as Epacrideoe by Ericea3 ; 

 and some tribes which form a considerable part of the 

 Australian peculiarities, as Dilleniacese, the leafless Acacise 

 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 Iridese, JMesembryanthemum, 

 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, Pensea, 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 

 harhara. 



We have not sufficient materials for a satisfactory com- 

 parison of the Elora of the higher latitudes of South 

 America with that of the Southern parts of Terra Austi'alis. 

 If, however, we may judge fi'om those at present in our 

 possession, it would seem that the general character of the 

 South American vegetation differs much more from the Aus- 

 tralian than this does from that of South Africa. Yet several 

 instances occur of the same or of very nearly related genera, 

 =89] peculiar to the southern hemisphere, AAdiich are common 

 to Terra Australis and South America, and which do not 

 exist at the Cape of Good Hope. Thus the Pavonia or Laii- 

 relia of Chili has its nearly related genus AtJierosperma iu 

 Van Diemen's Island ; where also a genus that I shall 

 name Tasmania occupies the place of the Wintera of South 

 America, from which it differs chiefly in having a single 

 ovarium ; a species of the Araucaria of Chili exists in New 

 Holland as well as in Norfolk Island and New Caledonia; 

 several Lomatice are found in South America ; a s])ecies of 

 Adelia grows in Terra del Fuego; and Goodenia littoralis 

 of the southern shores of Terra Australis is found not only 

 in New Zealand but on the opposite coast of America. 



Certain tribes of plants common to South Africa and 

 Terra Australis, and almost equally abundant in both these 

 countries, are either very sparingly produced or cease to 

 exist in South America. Others which abound in South 



