PAPERS READ. Plants which have become Naturalized in N". S. Wales. By W. Woolls, Ph.D., F.L.S. As, on several occasions, I have given partial lists of the plants which have become naturalized in N. S. Wales, I propose now to enumerate all such species as have been observed, and to arrange them systematically according to the plan pursued by Baron Mueller in his Census of the Australian Plants. There is a great difficulty in determining, in some instances, whether certain species are indigenous or introduced ; and as years roll on and native plants disappear in the progress of cultivation, the difficulty will be increased. In the preface to the Census, the Baron observes : — " The lines of demarcation between truly indigenous and more recently immigrated plants can no longer in all cases be drawn with precision • but whereas Alchemilla vulgaris and Veronica serpilli 'folia were found along with several European-Carices in untrodden parts of the Australian A lps during the authors earliest explorations, .4. arvensis and V. peregrina were at first only noticed near settlements. The occurrence of Arabis glabra, Geum urbanum, Agrimonia Eupatoria, Eupatorium cannabinum, Car-pesium cernuum and some others may therefore readily be disputed as indigenous, and some cpiestions concerning the nativity of various of our plants will probably remain for ever involved in doubts." Whilst it must be admitted, then, that there is some degree of uncertainty in dealing with species supposed to be of exotic origin, especially such plants as those to which the Baron refers, there are many which are known to have been introduced at particular times, and under particular circumstances, some having been introduced for industrial purposes, and others having sprung up amidst crops raised from foreign seed ; whilst the great majority of those to which the name of weeds is given, have been
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