6S 



District S. This has a slightly increased rainfall as compared 

 with C, and is mostly comprised of elevated ground in parallel 

 ranges of not inconsiderable height, collectively called the 

 Flinders Range. Outlying areas of District N., far within its 

 boundary, occur at Wilpena Pound, at Blinman, and in a 

 modified degree about Mount Serle ; the inclusion of so many 

 southern forms in the list for this district somewhat masks the 

 truly desert-character of its prevailing flora. For its southern 

 limit, I use the watershed-line, demarking the northern from the 

 southern stream-courses. 



District W. This is the south-western extension of C, and 

 presents much the same physical characters. However, in the 

 Gawler Range, there occurs a small collection of species, which 

 belongs to more southern latitudes ; otherwise the flora is 

 essentially Eremian. 



District M. — This area in its northern parts is a southerly 

 extension of C and S ; it comprises the Murray Desert, a plain 

 which abuts on the west against the Adelaide Chain, and its 

 north-oast extension to the Barrier Range, and is constituted of 

 Eocene and Pliocene strata, which are highly absorbent to water. 

 Its south-western and southern limits, as defined by geological 

 and topographical features, reach beyond the rainfall line of ten 

 inches ; and it becomes a question where best to fix the boundary, 

 though on the whole there is an abrupt change in the flora wher- 

 ever we pass from the Archaean to the Eocene rocks. The terres- 

 trial flora is largely comprised of Eremian species, but the 

 fluviatile and paludinal species are essentially Euronotian. 



II. The Euronotian Region. 



The flora of this region is of the type dominant in the wetter 

 parts of temperate Australia, except the extreme south-west. It 

 is essentially an aboriginal flora, being largely composed of en- 

 demic genera and species. 



District A. Herein is presented one of the chief subtypes of 

 the Euronotian flora, or at least such of it as occurs on the higher 

 elevations of the Adelaide chain ; the plants of the plains are 

 more widely distributed throughout the Euronotian region of 

 Australia. 



District N. This comprises the country to the north of a line 

 from the head of St. Vincent Gulf to the Burra. The elevated 

 country about Wirrabirra and Mount Remarkable, with its rela- 

 tively high rainfall, forms a small botanical outlier of the Ade- 

 laide chain. 



District Y. The flora of Northern Yorke Peninsula is an 

 extension of that of N ; that of the southern part is not known, 

 but we may anticipate certain aflinities with L and K. 



