Ammannia robusta (Grand Redstem) is a species of annual herb in the family Lythraceae. They have a self-supporting growth form. They are listed as endangered by COSEWIC. They are native to Santa Catarina, The Contiguous United States, Canada, Rio De Janeiro, and Mata Atlântica. They have simple, broad leaves and capsule fruit.
EOL has data for 17 attributes, including: