49 



The letters enclosed in brackets indicate that the species are 

 of modern introduction into the districts denoted by such 

 letters. 



The following table represents the number of species in- 

 habiting each region, and the number of species restricted to 

 each : — 



Total number of species . . 

 Number of restricted species 

 and marked varieties 



c 



M 



E 



S 



a 



b 



c 



688 



550 



455 



959 



267 



382 



643 



355 



81 



124 



272 



25 



31 



96 



3 



3 



2 



4 



— 



1 



3 



1 



9 13 



2 4 



The high percentage of restricted species inhabiting each 

 region seems to justify that botanical division of the province 

 which has herein been established. Nevertheless, the above 

 figures may not represent the whole truth ; thus the small 

 number of species catalogued for the Regions M and E includes, 

 perhaps, only the less common forms ; and if the real numerical 

 strength of each were known, doubtlessly the total of peculiar 

 species in the adjoining regions might be much reduced, though 

 the number of restricted species in Regions M and E would 

 not be materially altered. The same remarks will also apply 

 to the districts of Region S. It should be remembered that 

 the boundaries of the regions and districts are not rigidly 

 defined, as such can only be laid down after an exhaustive inquiry 

 into the climatological, botanical, and geological features of 

 each division And at the same time, that in a first attempt of 

 the kind, it has not always been easy to find the geographic 

 columns for each species, more particularly because one region 

 must overlap or pass gradually into another. 



Dr. Schomburgk's list of extra-tropical plants gives the 

 names of 1,214 species ; but the number is reducible to 1,074 

 by exclusion of certain introduced species and others not 

 known to belong to extra-tropical South Australia, and by 

 suppression of names not of specific value. Some species have 

 wrongly assigned to them a South Australian habitus in the 

 Flora Australiensis, by reason of certain Victorian localities 

 being quoted for this colony. Baron von Mueller has con- 

 siderably reduced the number of species recognised by Mr. 

 Bentham, but whether the results obtained are in accordance 

 with or opposed to the teachings of the living plants is a 

 question that each botanist must endeavour to answer for him- 

 self, as the plan of the present work does not admit of a dis- 

 cussion of the many questions raised by them. 

 D 



