Nature conservation

Threatened species

Western Water-starwort - 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: Callitriche cyclocarpa
Conservation status in NSW: Not listed
Commonwealth status: Not listed
Profile last updated: 07 Sep 2017


Western Water-starwort is an aquatic or amphibious plant. Its submerged leaves are linear and mostly one-nerved; upper emergent leaves are spoon-shaped, and three to five-nerved. Male and female flowers are found together in the angles where the upper leaves meet the stems (in the "axils"). In female plants, flowers are found in the lower axils. Flowers are accompanied by leaf-like processes called bracteoles.
A recent review of the genus Callitriche regarded Western Water-starwort as a synonym of the commoner Winged Water-starwort (C. umbonata). The review considered that the defining characteristic of the narrowly winged, non-bulbous fruit of C. cyclocarpa merely represents an immature state of the fruit of C. umbonata.


In NSW only recorded at “The Gut” near Koraleigh, on the floodway from the Murray to Wakool River, about 26 km NNW of Swan Hill. A record made in 1991 from the Poison Water Holes Creek near Narrandera has not been confirmed. Also recorded in Victoria.

Habitat and ecology

  • It has also been found in Victoria in River Red Gum (Eucalyptus camaldulensis) open woodland with an open grassy understorey dominated by Warrego Grass (Paspalidium jubiflorum) along river banks, and with wallaby grasses (Austrodanthonia setacea and A. caespitosa) on ground less-frequently inundated.
  • Also known from Melaleuca freshwater coastal wetland in Victoria.
  • Has been recorded in NSW and Victoria growing in thick patches in floodwaters.
  • Flowering and fruiting in September and November.
  • Aquatic forms of this species are submerged, except for the floating extremities; terrestrial forms are prostrate or shortly erect.

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