142 



Phytogeograpliic researcli in Kangaroo Island brouglit first to 

 notice fhe following additions to South Australian flora, though 

 they have subsequently been found in other parts of the 

 colony: — Pomaderris apetala, Cassinia specfahilis, JVilsonia Back- 

 Jiousii, Gaustis pentandra. 



Species of Extra- Australian Orighn. 



It is noteworthy that the number of more or less cosmo- 

 politan species is not great ; thus, whilst the number of such in 

 South Australia approaches 100, there are not more than 55 on 

 Kangaroo Island. With the exception of three, they all occur 

 on the larger insular mass of Tasmania, which possesses at the 

 least 90 extra- Australian species. The paucity of cosmopolitan 

 species on Kangaroo Island cannot well be explained except on 

 the assumption of isolation before immigration, else Tasmania, 

 so rich in peculiar genera and species, should possess even a 

 fewer number; whereas it contains nearly twice the number. 

 An analysis of the habitats of the several species indicates, 

 that two-thirds of the Kangaroo, plants of this category are 

 either maritime or paludinal. There are a few weeds, and 

 their occurrence as indigenous may be disputed. The wide 

 dissemination throughout Australia of plants of this kind may, 

 I think, be attributed to the agency of aboriginals, at least as 

 far as regards those species, the nativity of which is not ques- 

 tioned. Kangaroo Island had never been subject to such dis- 

 turbing influences until the last 50 years, hence its freedom 

 from aggressive plants. Of the native species occurring beyond 

 Australia also, the following are : — 



Maritime. 

 Lepidium ruderale Apiuni prostratum 



Cakile maritima Halophila ovata 



Capsella procumbens Euppia maritima 



Nitraria Schoeberi Lepturus incurvatus 



Frankenia Isevis Sporobolus virginicus 



Spergularia marina Distichlis maritima 



Suaeda maritima 

 Mesembrianthemum australe 

 sequilaterale 



The following widely distributed shore-species seem absent : — 

 JSalsoIa kali, Avicennia officinalis, Juncus onaritimus and Scirpus 

 waritimus. 



Paludinal. 

 Epilobium tetragonum Potamogeton natans 



Hydrocotyle Asiatica obtusifolius 



Cotula coronopifolia pectinatus 



Cotula filifolia Juncus bufonius 



