Nature conservation

Threatened species

Granite Zieria - profile

Indicative distribution


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Key:
known
predicted
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: Zieria obcordata
Conservation status in NSW: Endangered
Commonwealth status: Endangered
Profile last updated: 08 Sep 2020

Description

Dense, rounded, perennial shrub to 0.5 m high. Dark green leaves composed of 3 wedge-shaped leaflets, covered with small warts on the upper surface. The tip of the central leaflet is characteristically recurved to give it a notched appearance. Each leaflet 3-8.5 mm long and 1.3-3.7 mm wide, the margins somewhat toothed. Flowers with 4 petals, each 2-2.5 mm long, pale pink rapidly fading to white. Fruit a capsule about 5 mm across, deeply divided into 4 chambers.

Distribution

Occurs at two sites with a geographic range of 105 km. These are in the Wuuluman area near Wellington, comprising of a single subpopulation over 3 sites comprising up to 200 plants and Crackerjack Rock/Rock Forests area NW of Bathurst, with a subpopulation comprising of 14 sites, totaling to approximately 700 adults plants after good seasons.

Habitat and ecology

  • Grows in eucalypt woodland or shrubland dominated by species of Acacia on rocky hillsides. Also occurs in Eucalyptus and Callitris dominated woodland with an open, low shrub understorey, on moderately steep, mainly west to north-facing slopes in sandy loam amongst granite boulders. The altitude range of sites is 500 to 830 metres.
  • Associated vegetation includes Eucalyptus blakelyi, Brachychiton populneus and Acacia implexa woodland with pockets of low shrub understorey. Also in E. goniocalyx, E. blakelyi, E. macrorhyncha, A. doratoxylon, A. vestita and Callitris glaucophylla woodland with a shrubby understorey.
  • Understorey species include Pandorea pandorana, Isotoma axillaris, Westringia eremicola, Leucopogon attenuatus, Dillwynia sericea, Olearia ramulosa, Stypandra glauca, Stellaria pungens, Acacia vestita, Melichrus urceolatus, Cryptandra amara, Lepidosperma, Styphelia, Kunzea, Haloragis and Cheilanthes species.
  • Main flowering period is in spring (September-October), but plants tend to have flowers present throughout the year.
  • In wild populations, plants tend to grow in crevices between granite boulders, often in lines running downslope. The species has proved to be very difficult to cultivate. Best growth has been achieved with plants in a very sandy well-drained soil. Wild plants have strongly aromatic leaves.
  • Zieria obcordata is extremely sensitive to grazing and browsing disturbances by domestic stock and native herbivores. Heavily browsed plants and vigorous regrowth (following severe browsing by wallabies) have been recorded at sites.
  • Plants are tolerant of prolonged moderate drought conditions but highly susceptible to extreme summer heatwaves that occur over more than five consecutive days.
  • Mass regeneration events can occur after above-average rainfall seasons, otherwise very low levels of recruitment occur each year.
  • Plants known to first flower at 10cm high.

Regional distribution and habitat

Click on a region below to view detailed distribution, habitat and vegetation information.


Threats

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
South Eastern HighlandsBathurst Known None
South Eastern HighlandsHill End Predicted None