Nature conservation

Threatened species

Isotoma fluviatilis subsp. fluviatilis - 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: Isotoma fluviatilis subsp. fluviatilis
Conservation status in NSW: Not listed
Commonwealth status: Extinct
Gazetted date: 04 Jul 2003
Profile last updated: 26 Oct 2020


Listed as Hypsela sessiliflora. A prostrate herb with 2 - 3 cm branches and 2 - 4 mm ovate to oblong leaves. Solitary, more or less sessile flowers are white or pale purple occurring in the spring, but also when conditions are suitable at other times of the year. Albrecht et al. (2015) assessed the taxonomic status of Hypsela sessiliflora using both morphological and molecular data and determined that it is a synonym of Isotoma fluviatilis (R.Br.) F.Muell. ex Benth.
subsp. fluviatilis, a widespread taxon not listed under the Act.


Currently known from only two adjacent sites on a single private property at Erskine Park in the Penrith LGA. Previous sightings are all from western Sydney, at Homebush and at Agnes Banks.

Habitat and ecology

  • Known to grow in damp places, on the Cumberland Plain, including freshwater wetland, grassland/alluvial woodland and an alluvial woodland/shale plains woodland (Cumberland Plain Woodland) ecotone.
  • May be an early successional species that benefits from some disturbance.
  • Possibly out competed when overgrown by some species such as Cyndon dactylon.

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