Senecio linearifolius var. dangarensis - 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: Senecio linearifolius var. dangarensis

Conservation status in NSW: Endangered

Commonwealth status: Not listed

Gazetted date: 21 Oct 2005

Profile last updated: 04 Mar 2024

Description

Senecio linearifolius var. dangarensis is a many-stemmed, aromatic, perennial species. It is blue-green, weakly shrubby and up to 2 metres high. The leaves on the upper stems are narrow to very narrow-elliptic, with more or less distinct secondary venation and distinct tertiary venation. Yellow flowers appear in corymbose inflorescences of numerous heads . There are 7-9 ray florets and 13-22 disc florets in each flower head.

Distribution

Senecio linearifolius var. dangarensis is restricted to two known populations occurring on basalt cap peaks in Goulburn River and Wollemi National Parks. The estimated population at Goulburn River National Park is up to 10,000 plants, covering an area of 9 ha. The Wollemi National Park population is estimated to contain up to 21,855 plants over an area of 4.65 ha, giving a total population size of 31,855 plants. Population size can fluctuate widely depending on rainfall.

Habitat and ecology

Grows in woodland communities on basalt. Populations have been observed to significantly decline during drought conditions and recover quickly via germination of the soil-stored seed bank when wetter conditions return. Flowering occurs in some individuals as early as seven months post-emergence, but more commonly between 12 and 18 months after germination.

Regional distribution and habitat

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

Sydney Basin

Threats

At risk from stochastic events due to highly restricted distribution.
Feral animals degrading habitat.
Insufficient understanding of ecological/ biophysical processes influencing restricted distribution.
Competition from weeds may reduce seedling recruitment.
Prolonged drought conditions causing water stress and eventual population declines.
High frequency fire suppresses recruitment.

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

Manage infestations of mixed weeds.
Control feral animals.
Monitor mature plants, seedlings, mortality, reproduction and threats within the population.
Undertake surveys to identify unrecorded populations.
Maintain viable ex-situ seedbank and/or living collection.
Research ecological requirements and fire ecology of the species.
Implement appropriate fire regime for the species.

Information sources

Bell, S.A.J. (2017) Mt Dangar Multi-species Saving our Species Project: Year 1 (2016-2017) Summary Report. Unpublished Report to NSW National Parks and Wildlife Service. June 2017. Eastcoast Flora Survey & Cormal Environmental.
Bell, S.A.J. & Lamrock, P. (2018) Mt Dangar Multi-species Saving our Species Project: Year 2 (2017-2018) Summary Report. Unpublished Report to NSW National Parks and Wildlife Service. October 2018. Eastcoast Flora Survey & Cormal Environmental.
Bell, S.A.J. & Lamrock, P. (2020) Mt Dangar Multi-species Saving our Species Project: Year 3 (2018-2019) Summary Report. Unpublished Report to NSW National Parks and Wildlife Service. January 2020. Eastcoast Flora Survey & Cormal Environmental.
Bell, S.A.J. & Lamrock, P. (2020) Mt Dangar Multi-species Saving our Species Project: Year 4 (2019-2020) Summary Report. Unpublished Report to NSW National Parks and Wildlife Service. August 2020. Eastcoast Flora Survey & Cormal Environmental.
Bell, S.A.J. & Lamrock, P. (2021) Mt Dangar Multi-species Saving our Species Project: Year 5 (2020-2021) Summary Report. Unpublished Report to NSW National Parks and Wildlife Service. August 2021. Eastcoast Flora Survey & Cormal Environmental.
Bell, S.A.J. & Lamrock, P. (2022) Mt Dangar Multi-species Saving our Species Project: Year 6 (2021-2022) Summary Report. Unpublished Report to NSW National Parks and Wildlife Service. October 2022. Eastcoast Flora Survey & Cormal Environmental.
Bell, S.A.J. & Lamrock, P. (2023) Mt Dangar Multi-species Saving our Species Project: Year 7 (2022-2023) Summary Report. Unpublished Report to NSW National Parks and Wildlife Service. August 2023. Eastcoast Flora Survey & Cormal Environmental.
Mickaill, L.N.N., Bell, S.A.J., Beranek, C.T. (2020) Dispersal potential in two restricted and five wide-ranging Senecio (Asteraceae) taxa from central eastern New South Wales, Australia. Australian Journal of Botany 68 333-344.
NSW Scientific Committee (2005) Senecio linearifolius var. dangarensis (a shrub) - endangered species determination - final. DEC (NSW), Sydney.
Thompson, I.R. (2004) Taxonomic studies in Australian Senecio (Senecioneae-Asteraceae). II. The shrubby discoid species and the allied radiate species Senecio linearifolius. Muelleria 20, 67-110.

IBRA Bioregion	IBRA Subregion	Known or predicted	Geographic restrictions region

Sydney Basin

Kerrabee

Known

None

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