Nature conservation

Threatened species

Floating Swamp Wallaby-grass - profile

Indicative distribution

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The areas shown in pink and/purple are the sub-regions where the species or community is known or predicted to occur. They may not occur thoughout the sub-region but may be restricted to certain areas. ( click here to see geographic restrictions). The information presented in this map is only indicative and may contain errors and omissions.
Scientific name: Amphibromus fluitans
Conservation status in NSW: Vulnerable
Commonwealth status: Vulnerable
Profile last updated: 15 Aug 2018


A perennial grass to 0.8 m tall that spreads by both underground and above-ground stems. Flowering stems tend to be somewhat sprawling, except for the flowering portion of the stalk, which is erect and up to 35 mm long. The leaf blade is 2 - 4.5 mm wide, rough to touch and deeply ribbed. The structure that breaks away from the flower-stalk (and contains the seed) is two-toothed, with a straight bristle arising about half way up its back. The species is virtually aquatic, often with only the flower heads above the water.


There are many historic collections in the City of Greater Albury. It has been recorded recently in lagoons beside the Murray River near Cooks Lagoon (Shire of Greater Hume), Mungabarina Reserve, East Albury, at Ettamogah, Thurgoona (Charles Sturt University Campus), near Narranderra, and also further west along the Murray River (near Mathoura) and in Victoria. There is a recent record of this species near Laggan in Upper Lachlan Shire. It is also found in Victoria and in Tasmania.

Habitat and ecology

  • Amphibromus fluitans grows mostly in permanent swamps. The species needs wetlands which are at least moderately fertile and which have some bare ground, conditions which are produced by seasonally-fluctuating water levels.
  • Habitats in south-western NSW include swamp margins in mud, dam and tank beds in hard clay and in semi-dry mud of lagoons with Potamogeton and Chamaeraphis species.
  • Flowering time is from spring to autumn or November to March.
  • Amphibromus fluitans appears to fruit later than the other grasses with which it grows. The flower heads remain almost hidden by the leaf sheaths until the seeds are nearly mature, and even then elongation of the stems is barely sufficient to expose the heads completely.
  • Disturbance regimes are not known, although the species requires periodic flooding of its habitat to maintain wet conditions.
  • Has been observed covering several hectares in area. The species is also recorded as occasional to common in populations.

Regional distribution and habitat

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Recovery strategies

Activities to assist this species

Information sources

IBRA Bioregion IBRA Subregion Known or predicted Geographic restrictions region
NSW South Western SlopesInland Slopes Known None
NSW South Western SlopesLower Slopes Known None
Other StateVIC Known None
RiverinaMurray Fans Known None
South Eastern HighlandsCrookwell Known None