TvrnonrcTORY essay. 
c. Between three-fourths and one-half not endemic 
Cruciferae. Verbenaceae. 
Sapindacea?. Labiate. 
Lobeliacea?. Chenopodiese. 
Apocynea?. Amaranthacea?. 
EuphorbiacoaD. Liliaccao. 
Orchideo?. C yp a MOM B. 
Smilacea*. Graminca\ 
The above estimates are very rude, and intended to show tendencies in the general 
It appears from them, that out of the twenty-five Orders, half of whose genera arc endcu 
are really much restricted in distribution; and that there are thirty- nine Orders universally 
over the globe which play a conspicuous part in the vegetation of Australia, but of whose 
than half are peculiar to that country. On the other hand, the twenty-three first-named Orders com 
prise considerably more than half the species of Australian Flowering Plants. 
In point of number of species they contain, the Australian genera may be arranged approxi 
mately, as follows. 
Above 200 species, — 
Acacia. 
Above 100 specie 
Eucalyptus. 
Melaleuca. 
Leucopogon. 
Stylidium. 
Above 50 species, — 
Pimelea. 
Goodenia. 
Persoonia. 
Pultensea. 
Daviesia. 
Eurybia. 
Boronia. 
Banksia. 
Dryandra. 
Lepidosperma. 
Xerotes. 
Dodonsea. 
Drosera. 
Dampicra. 
Hclichrysun 
Trickmiuin. 
These genera together comprise upwards of 2,000 species, are almost without exception very 
characteristic of extratropical Australian vegetation, and nearly all are highly characteristic of Aus- 
tralia and its islands. 
One-half of the genera of Australian Flowering Plants are included in the following Orders :— 
1. Composite. 5. Cyperacea?. 9. Proteaceae. 12. Goodeniaceae. 
2. Leguminosse. 6. Euphorbiaceae. 10. Scropkularinese. 13. Liliaceae. 
3. Grainineae. 7. Orchideae. 11. Kubiacese. 14. Labiatas. 
4. Myrtacese. 8. Epacridese. 
Of the peculiar genera of Australia, on the other hand, one-half of the whole are comprised in 
the following Orders : — 
1. Composita). 4. EpacrideaB. 6. Goodeni 
2. Leguminosse. 5. Proteaceaj. 7. Liliaceae 
3. Myrtacese. 
Had I the materials, it would have been interesting to have extended this inquiry to the 
character of the genera themselves, and especially as to whether the arboreous or herbaceous pre- 
vailed, one of the most striking characters of the Australian vegetation being the great number of 
peculiar genera, amongst which a large proportion are trees or large shrubs. 
8. Orchideae. 
9. Euphorbias 
