Aiustralian Ribbon Weed (Vallinseria australis) is a submerged freshwater plant native to most parts of Australia and Tasmania, It grows as flat. grass-like blades up to 3000 mm long, with small emergent flowers on long stalks. The stallks contract after flowering and bear string-bean-like capsules, releasing floating seeds. It is sold in the aquarium and fishpond industry. It was first foumd in 2021, in the Sacramento River, south of Rio Vistta, This plant is rare, but of concern as a potenital invader (California Department of Fish and Wildlife 2023)