The plant identified by Kassalmann as Limnophila aromaticoides (our former "Gratiola") was the only one that was flowered. It wasn't compared directly to a specimen known to be L. aromatica.
Limnophila aromatica, the deep purple variation from Oriental Aquarium, has different growth habits and coloration from the former plant. No one in the U.S. has flowered L. aromatica, L. aromaticoides, and L. hippuroides (another OA plant) together for a flower comparison to see if they are all actually the same species. However, it wouldn't surprise me if they were considering the extreme variation in the fine leaved Ludwigia inclinata group (Cuba, Pantanal, Araguaia, etc).
Carlos