cvi *LORA OF TASMANIA. {Naturalized Plants 
circumstances which seem to be temporarily favourable will prove to be so permanently : perhaps they 
over-stimulate, and will, by gradually effecting a change on the constitution of the naturalized plants, 
either render them eventually distinct forms, or bring on degeneracy and consequent extinction. 
In all these discussions it must be borne in mind that no wild species is stationary in number of 
individuals. None will survive all time ; each must- reach a period of maximum development, and 
decline from it to extinction ; and as we do not know that man can add to or take from the sum of 
vegetable matter on the globe, it may very well be the case, that in every instance where his opera- 
tions tend to an inordinate development of a species in individuals, he is shortening the period of 
time otherwise allotted for the duration of that species. Man, as I have observed before (p. viii. in 
note), may hasten or retard the operations of Nature, but cannot reverse them. 
The following list refers almost entirely to Melbourne, a colony established about twenty years 
ago. I have no such list of the introduced plants of any other Australian colony, and the scattered 
notices of naturalized plants that I have met with in various travels, are not sufficiently definite to be 
quoted. Thus, in Mitchell's first journey, I find a singular observation, that Horehound and common 
Grass, or Dog-tooth Grass, spring up wherever the white man sets his foot, by which I assume that 
the Marrubium and Cynodon are meant, but cannot be sure. 
Catalogue of some of tie Naturalized Plants of the Australian Colonies, (chiefly compiled from the Mel- 
bourne collections and notes of F. Adamson, Esq.,) to which are added the species enumerated in 
Mueller's Reports, and Backhouse's and Gunn's MSS. 
The letter A indicates that the species is also naturalized in the northern United States, according to 
Professor Asa Gray's Manual. 
A 1. Eanunculus acris, L. Very common at Melbourne. (Britain, pastures.) 
A 2. Eanunculus sceleratus, L. Victoria. (Britain, pastures, ditches.) 
A 3. Eanunculus muricatus, L. Victoria. (Europe, cornfields.) 
A 4. Delphinium Consolida, L. New South Wales. (Europe, cornfields.) 
5. Papaver album, L. New South Wales. (Europe.) 
A 6. Papaver dubium, L. New South Wales. (Britain.) 
7. Escholtzia California, Cham. Victoria. (California.) 
A 8. Argemone Mexicana, L. New South Wales. (South United States.) 
A 9. Fumaria officinalis, L. (Britain, waste places.) 
A 10. Barbarea precox, L. An overpowering weed in Tasmania, Bachh. (Britain, hedges, etc.) 
A 11. Nasturtium officinale, L. (Britain, water plant.) 
A 12. Sisymbrium officinale, L. Victoria. (Britain, roadsides.) 
A 13. Capsella Bursa-pastoris, L. Ubiquitous. (Britain, waste places.) 
14. Lepidum sativum, L. New South Wales. (South Europe.) 
A 15. Lepidum ruderale, L. Victoria. (Britain, waste places.) 
A 16. Senebiera didyma, Pers. Victoria, Tasmania. (Britain, waste places.) 
A 17. Eaphanus Baphanistrum, L. Victoria. Sometimes colouring the cornfields pink, Adamson. 
(Britain, weed of culture.) 
A 18. Brassica Napus, L. Tasmania. (Britain, weed of culture.) 
A 19. Sinapis arven*is, L. Tasmania. (Britain, weed of culture.) 
20. Maho. pusilla, With. Grows to a great size (2 feet) in cultivated ground, looking very 
different from its usual small state. Victoria, Adamson. (Europe.) 
A 21. Malva sylvestris, L. Victoria and Tasmania. (Britain, roadsides.) 
