138 BOTANICAL GEOGRAPHY 
Callicoma, besides the few Australian species of Rubiacee and 
Malvaceae, here occur. 
Turn» cLAss. The Argyle Vegetation.—1t may be seen 
and is characteristic of all those park-like spots, with their 
stately Eucalyptus Trees, growing at some distance from each 
other, with very little underwood :—places so peculiar, that 
they have struck all travellers, from "Tasman down to the 
wanderers of the present day. This vegetation prevails upou 
every kind of rock, which, by its easy decomposition and the 
alumine which it contains, is capable of being converted into — 
soil; as Greywacke, Trap, Limestone, Granite, &c. The Coal- — 
sandstone is uncongenial to it, because containing so much — 
Silica, that nothing but the scanty growth described as — 
belonging to the First Class can thrive upon it. The Argyle 
Vegetation contains species of Thlaspi, Cerastium, Goniocarpus, — 
Convolvulus, Euphrasia, Prunella, Thymus, Verbena, Scandia, — ; 
Hydrocotyle, Desmodium, Lespedeza, Lotus, Oxalis, Silene; — 
Hypericum, Caucalis, Apium, Arabis, Dianella, Brachycome, — 
Myriogyne, Leptomeria, Scleranthus, Polygonum, Exarrhena; —— 
these are amongst the most characteristic of its productions; 
whilst the family of Composite also, as Calotis, Helichrysums. & 
Bellis, Senecio, Sonchus, Angianthus, Gnaphalium, Cotula, — 
Podolepis and Craspedia, also exhibit the discrepancy that pre- P 
vails between the coast-productions and the inland Flora d 
Australia. The Gramineae, too, such as Anthistiria australis, — 
Stipa, Poa australis, Holcus plumosus and Triticum, combine tO — 
form part of the turf of these peculiar spots, while this tribe — 
is entirely absent in the districts which produce the first 
Class of Vegetation. It is further evident, that whilst our first 
Division is composed, as already stated, of harsh and stiff. 
plants, the latter mainly consists of herbs which are soft and 
jucy; and whilst so much has been said of the mercantile 
and commercial importance which attaches to the herbage of 
ha vast continent, we think this is the first time the sub- 
ject has been treated in a scientific light. a 
Fourra cLaAss. The Minero Vegetation—This comprê-- 
hends the Flora of the Downs of that name surrounding the 
