47 



an the "Flora Australiensis," I have affixed to each ordinal name 

 the number of the volume of that work dealing with that 

 particular order of plants. And following the name of the 

 .species is a reference to the page of the " Flora Australiensis " 

 on which its diagnosis will he found. The references to species 

 not contained in the " Flora Australiensis " are to Baron 

 Mueller's " Fragmenta Phytographia?," thus : — Menkea sphcero- 

 carpa, F.M. ; Frag. VIII., 223, is described on page 223 of 

 volume VIII. of that work, the authority for the name being 

 Ferdinand Mueller. 



To give some idea of the distribution of the constituents of 

 the flora of extra-tropical South Australia, that part of the 

 province is divided into the following regions and districts :— 



Region C, or the Central Australian Reg-ion, which 

 embraces the country north of a line from the Head of the 

 Great Australian Bight following eastward the line referred 

 to in the 11th Schedule of Crown Lands Act of 1877, extending 

 southward so as to include Lake Grilles, and sweeping round 

 the east side of Lake Torrens, thence to the west side of Lake 

 Frome, and southward to the latitude of Menindie (about 32 

 degrees) . 



This region probably admits of division into («) Desert and (li) 

 Central Australian ; the latter division embracing the elevated 

 country of the Musgrave, MacDonnell's and other ranges, 

 which extend in a general east and west direction in the north- 

 west central parts of the colony. Constituting a part of the 

 same region, by its geological and botanical features, is the 

 narrow strip of hill country traversed by the transcontinental 

 telegraph line between the head of Lake Torrens and the 

 Tropic of Capricorn. 



By such division the desert region embraces the vast Tertiary 

 plains and deserts; whilst the Central Australian region is 

 comprised of more elevated land of Palaeozoic age. 



Though the Central Australian subregion verges on the 

 tropics, yet its flora is of the Desert type, somewhat modified 

 by the presence of a few families and genera which herein 

 reach their southern limits. 



Region C is characterised by the large proportion of 

 Crucifers, Zygophyllea?, Malvaceae, Sterculiacea>, Euphorbiacea^, 

 Amarantacea^, Chenopodiacese, Portulacea?, Ficoidea^, Gooden- 

 ovieaj, Solanacea?, Verbeuacea?, Myoporinea?, and Grasses. The 

 only representatives in South Australia proper of Capparids, 

 Elatineae, Cycads, and Palms are here met with. The following 

 important orders, so characteristic of Region S, or the South 

 Australian region, are either absent or poorly represented : — 

 Pittosporese, Droseracea?, Caryophyllacea?, Rhamnacea?, Epae- 

 ridese, Orchidacea 1 , Liliacea?, and Juncacea?. 



