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: Zieria baeuerlenii
Profile last updated:
07 Jun 2022
Description
Bomaderry Zieria is an 80 cm tall shrub, with clover-like (trifoliate) leaves that are covered in velvety hairs. Each leaflet is rounded and blunt, to 12 mm long and 9 mm wide, with curled-under edges. Shrubs produce masses of small pinkish-white flowers between September and October, arranged in clusters of three to seven.
Distribution
The species occurs in only one location north-west of Nowra. The population occurs in a total of 43 colonies in six discrete clusters. These clusters are confined within a 0.5 km x 1.0 km area of the bushland, and are found on both sides of Bomaderry Creek.
Habitat and ecology
- Bomaderry Zieria occurs on skeletal sandy loam overlaying sandstone, on a rocky plateau amongst sandstone boulders in either shrubby open forest, shrubby woodland or closed scrub.
- Seed production has never been observed in the Bomaderry Zieria and all evidence collected to date suggests that the species has lost its capacity to reproduce sexually.
- Plants resprout following fire.
Regional distribution and habitat
Click on a region below to view detailed distribution, habitat and vegetation information.
Threats
- Increased nutrients and other pollution from adjoining developments poses a threat to a small part of the population.
- Habitat damage associated with illegal rubbish dumping, vandalism, unintentional trampling and bushrock removal.
- Habitat disturbance during powerline maintenance poses a threat to a small part of the population.
- Weed invasions resulting in the loss of habitat poses a threat to some colonies, particularly those on the eastern side of Bomaderry Creek.
- Grazing by rabbits, particularly of new shoots sprouting from the rootstocks.
- Frequent fire is a threat in that some parts of the Bomaderry Zieria habitat have experienced several fires caused by arson over the last decade. Some Bomaderry Zieria plants are believed to have been killed where previous fire intensity has been high.
- Risk of local extinction via stochastic processes due to the restricted distribution of the species.
- One of the possible routes of the Bomaderry Link Road runs very close to part of the population and would pose an indirect threat to the plants in this vicinity.
- Some of the population occurs on unreserved lands and potential future land management use/practices may not be sympathetic to the conservation of the species.
Recovery strategies
A targeted strategy for managing this species has been developed under the Saving Our Species program; click
here for details. For more information on the Saving Our Species program click
here
Activities to assist this species
- Control rabbits.
- Exclude deliberate fires (e.g. hazard reduction burns and picnic fires) from the site containing the population.
- Ensure run-off from sites above the population is controlled.
- Limit vehicle access to the site to deter rubbish dumping.
- Erect markers to alert maintenance staff to the presence of this species.
- Fence sites to protect from rabbits.
- Control threatening weeds where necessary.
- Mark sites and potential habitat onto maps used for planning powerline maintenance work.
Information sources
- Harden, G.J. (ed.) (2002) Flora of New South Wales. Volume 2, Revised Edition. UNSW, Sydney.
- NSW National Parks and Wildlife Service (2002) Recommendation for the Identification of Critical Habitat for the Bomaderry Zieria (Zieria baeuerlenii) - A recommendation report prepared for public exhibition pursuant to Part 3 of the Threatened Species Conservation Act 1995. NSW National Parks and Wildlife Service, Hurstville, NSW.
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