Limnobium sp. (Frogbit)
Limnobium laevigatumn: Prohibited Matter NSW.
In NSW, if you see this plant report it. Ring 1800 680 244. General biosecurity duty NSW, with additional restrictions.
https://weeds.dpi.nsw.gov.au/Weeds/Details/286
Gallery
Regional distribution
Limnobium sp. is listed in the following regions: