Now that one, Caddo Lake, a mystical preserve of centuries-old mossy cypress breaks, teeming fisheries and waterfowl habitats, is under siege by a fast-spreading, Velcro-like aquatic fern, Salvinia molesta, also known as Giant Salvinia.
From the article: NY Times article: "In East Texas, Residents Take On a Lake-Eating Monster"
I do not think I have ever seen this particular plant in the hobby, but this is probably a good reminder for us to be careful about what, and how, we dispose of our aquarium plants. Personally, I must say it is all to easy to forget and dump some without thinking!
As a side-thead, where is a good source to find out about prohibited plants by country, state or locality?