362 E. C. ANDREWS. 
leaf of Samadera Bidwilli (Simarubez), which the ordinary 
botanist, not well versed in Hucalyptus studies, might 
mistake for a leaf of that genus. 
In a note shortly to be issued by Mr. Cambage and the 
writer, it may be seen that the evidence is overwhelming 
against the probability of any dicotyledonous genus which 
is endemic in Australasia, having existed in any other 
continent in either Cretaceous or Tertiary time. These 
endemic genera, such as those of the Australian Podalyrieze 
in Leguminose, as Hucalyptus and others in Myrtace, 
form peculiar groups, all evidencing a similar origin, as a 
response to a common geographical environment, and one 
which, during the Mesozoic, does not appear to have 
existed elsewhere during, or prior to, the isolation of Aus- 
tralia from the tropics. These endemic types are so 
numerous, both in genera and species, so full of vitality 
and endurance, that it would be impossible to believe in 
their annihilation, one and all in Kurope, Asia, Africa and 
America, without leaving any closely related types had 
they existed in those countries in Tertiary time. In this 
connection it is of little use to call in the aid of the 
aggressiveness of the Scandinavian and Himalayan floras 
as a means of annihilation of the types under consideration 
in the Northern Hemisphere. In the first place the Aus- 
tralian types are mainly xerophytes, and would not enter 
into competition with luxuriant tropical vegetation inas- 
much as they avoid such growths even in Australia.* But 
if forms such as Hucalyptus, Hakea, Pultenzea, the phyl- 
lodineous Acacias, Styphelia, Boronia, Leptospermum, 
Banksia, Kunzea, Daviesia, and Persoonia, had gained 
access either to South Africa or to the plains and rocky, 
sandy, or waste areas of Eurasia and America there would 
be little need to entertain any fears as to their ability to 
maintain themselves in such localities. 
1 (2), pp. 529 - 534. 
Ba ii 
