Ammannia arnhemica is not widely recognized in major botanical references or general encyclopedic sources. Consequently, detailed, verifiable information about its taxonomy, morphology, distribution, ecology, or uses is unavailable.
Possible etymology and contextual usage
- The generic name Ammannia honors the Swiss botanist Johann Amman (1707–1741) and is applied to a group of herbaceous plants within the family Lythraceae, many of which are aquatic or semi‑aquatic.
- The specific epithet arnhemica (or arnhemensis) typically denotes an association with Arnhem Land, a region in the Northern Territory of Australia.
Given the lack of accessible, reliable sources, further factual details about Ammannia arnhemica cannot be provided at this time.