Amphibromus fluitans
species of monocots (single seed leaf), venacular name(s): River Swamp Wallaby-grass, Floating Swamp Wallaby-grass
Amphibromus fluitans, water brome (New Zealand), river swamp wallaby-grass, or floating swamp wallaby-grass (Australian) is a species of true grass in the tribe Poeae.
Description
Amphibromus fluitans is a perennial, stoloniferous, semi-aquatic grass that forms large grey-green mats. Spikelets are 15-25mm long, with 3-6 laterally arranged florets, tipped with awns on the lemmas, between 7-18mm long.
It is very difficult to identify without fertile parts. Thus, it can be confused with other aquatic grasses like Agrostis stolonifera, Alopecurus geniculatus, or Glyceria.
Distribution
Amphibromus fluitans is indigenous to New Zealand and Australia.
In New Zealand, it is found in the North Island from Ninety Mile Beach and Karikari Peninsula in Northland to Paekākāriki and Lake Wairarapa in Wellington. In the South Island, it has been found at three locations: Maher's Swamp near Punakaiki (1991), Lake Tekapo (1935), and Lake Heron (2006).
In Australia, it is found in New South Wales, Victoria, and Tasmania.
Habitat
Amphibromus fluitans is found in seasonally dry wetland or on edges of shallow lakes and lagoons from lowlands to montane.
The public source identifies “Amphibromus fluitans” as species of monocots (single seed leaf), venacular name(s): River Swamp Wallaby-grass, Floating Swamp Wallaby-grass. This brief keeps that definition visible, then builds a research path around Amphibromus, fluitans and species.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Amphibromus fluitans”, the useful work is to connect “species of monocots (single seed leaf), venacular name(s): River Swamp Wallaby-grass, Floating Swamp Wallaby-grass” to the records capable of establishing context and consequence.
Place names and jurisdictional language are key evidence: both can reveal earlier catalogue descriptions and overlooked record series. The source revision retrieved here is dated Feb 5, 2026. The linked authority identifier is Q27828347. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1991, 1935 and 2006.
A single description cannot reconcile every naming convention, rebuilding phase or administrative transfer associated with a place. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “Amphibromus fluitans”, its source revision and the description used here.
- Expand the search: follow Amphibromus fluitans primary sources, Amphibromus fluitans archive and Amphibromus research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Amphibromus fluitans”?
- Which authority defined the place, boundary or structure at the relevant date?
- Which earlier names or jurisdictions may reveal additional records?
Search terms from this dossier
This entry incorporates text from “Amphibromus fluitans” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.