http://weeds.dpi.nsw.gov.au/Weeds/Details/117
http://keyserver.lucidcentral.org/weeds/data/media/Html/sagittaria_platyphylla.htm
Sagittaria platyphylla is listed in the following regions:
Canberra & Southern Tablelands | South Coast
Species page sighting lists are under redevelopment and will return very soon.