Ramey (2001) states that, "Hygrophila costata is entirely emersed or terrestrial. It is much larger and taller (to 80 cm), mostly erect, with much larger leaves, and flowers along the entire stem (rather than just at the top)."
The Global Invasive Species Database is managed by the
Invasive Species Specialist Group (ISSG) of the IUCN Species
Survival Commission. It was developed as part of the global
initiative on invasive species led by the Global Invasive
Species Programme (GISP) and is supported through partnerships
with the National Biological Information Infrastructure,
Manaaki Whenua-Landcare Research and the University of
Auckland. Conditions of use.