Establishing which are native plant species.

http://www.google.com.au/search?hl=en&source=hp&q=carpobrotus+rossi&meta=&aq=f&aqi=g1g-v9&aql=&oq=
http://www.google.com.au/search?hl=en&source=hp&q=carpobrotus+edulus&meta=&aq=f&aqi=&aql=&oq=
In the past i have just assumed that Iceplants were all introduced species. I assumed this as they are sometimes very bright crimson and people go for that in a plant. No this was not correct in the case of carpobrotus r which is Australian native. 
 The lemon and sometimes lilac coloured carpobrotus e which is a very similar succulent Iceplant is not Australian native. It is South African native established widely as a pest elsewhere.
Iceplants or Pigface plants are featured at the above links.
Scroll down to the images of 2 pigface types at the above links, both of which appear similar.    Yet the lemon and lilac coloured one- carpobrotus e is not Australian native whilst the crimson one-carpobrotus r is.      *lux1930 is not a science site.
 carpobrotus e has become an established(not native) in California where it was introduced and is now a pest plant.