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Also called kariba weed.
An ♒︎ aquatic fern, part of family Salviniaceae.
Native to southeastern 🇧🇷 Brazil. Invasive > Global Invasive > in USA+Canada Invasive > report it! Invasive > in USA Invasive > in Michigan prohibited in Michigan, incl. seeds, fragments and derivatives (.pdf)
Biological Control in Eastern USA (.pdf page 25)
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♒︎ aquatic plants