Indicative distribution
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.
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click here to see geographic restrictions).
The information presented in this map is only indicative and may contain errors and omissions.
Scientific name: Hydrocharis dubia
Profile last updated:
11 Oct 2022
Description
An aquatic perennial with emergent and floating leaves; stolons rooted in shallow water, floating across deeper water. Leaves with a petiole up to 12 cm long and blade shape broad-ovate to circular, up to 6 cm long and nearly as wide, with a heart-shaped to kidney-shaped base. Flowers 2–3 cm diameter with three petals 10–15 mm long, rounded, white, yellow at the very base. Male flowers grouped 1–4 together on short stems. Female flowers arising singly on a stem 1–8 cm long. Fruit is berry-like, 5–10 mm long, maturing underwater. Seeds are numerous, 1–1.5 mm long and have been described as both echinate (spiny) and tuberculate (warty).
Distribution
Known from South East Asia, New Guinea and Australia. In Australia, recorded from Fredrickton on the NSW north coast to near Charters Towers in north Queensland.
Habitat and ecology
- Found floating in deep water or rooted in shallow water
- Occurs in pools, lakes, lagoons or slow moving streams
- Reported to flower from Spring to Autumn
Regional distribution and habitat
Click on a region below to view detailed distribution, habitat and vegetation information.
Threats
- Changes to hydrology and water quality
- Grazing by domestic stock.
- Trampling by domestic stock.
- Aquatic weed invasion
- Inappropriate aquatic weed control
Recovery strategies
Priority actions are the specific, practical things that must be done to recover a threatened species, population or ecological
community. The Office of Environment and Heritage has identified
0 priority actions
to help recover the Frogbit in New South Wales.
Activities to assist this species
- Protect waterbodies from drainage, development and degradation
- Control livestock access to waterbodies and provide off-site water points
- Undertake weed control using methods that will not damage the species
- Provide guidance to land managers on weed control in species habitat
Information sources
- Stanley, T.D. and Ross, E.M. (1989) Flora of South-Eastern Queensland. Volume 3. Queensland Department of Primary Industries: Brisbane.
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