In addition, proponents and land managers should refer to the Recovery Plan (where available) or the Conservation Advice (where available) for recovery, mitigation and conservation information.
|EPBC Act Listing Status||Listed as Critically Endangered|
|Adopted/Made Recovery Plans|
|Other EPBC Act Plans||
Threat abatement plan for disease in natural ecosystems caused by Phytophthora cinnamomi (Department of the Environment, 2014a) [Threat Abatement Plan].
Federal Register of
Declaration under s178, s181, and s183 of the Environment Protection and Biodiversity Conservation Act 1999 - List of threatened species, List of threatened ecological communities and List of threatening processes (Commonwealth of Australia, 2000) [Legislative Instrument].
Amendment to the list of threatened species under section 178 of the Environment Protection and Biodiversity Conservation Act 1999 (107) (09/09/2011) (Commonwealth of Australia, 2011c) [Legislative Instrument].
Documents and Websites
|State Listing Status||
|Scientific name||Prostanthera marifolia |
|Reference||Brown, R., (1810) Prodromus Florae Novae Hollandiae: 509 [tax. nov.]|
This is an indicative distribution map of the present distribution of the species based on best available knowledge. See map caveat for more information.
From Australian Plant Image Index
View larger image
|Other illustrations||Google Images
The Seaforth Mintbush is morphologically and genetically similar to Prostanthera densa, although the two are considered separate species (Conn et al. 2013).
Seaforth Mintbush is a small shrub growing to around 30 cm high and with sparsely to moderately hairy branches (NSW SC 2008) with faintly aromatic foliage and delicate purple flowers (Warringah Council n.d). The leaves of this species are oval to almost elliptic in shape and are 8–12 mm long, 4–6 mm wide, tapered towards the base and rounded at the tip. The leaf margins are generally smooth. The leaves are green in colour, sparsely to moderately hairy (as on the branches), sparsely glandular on the underside, with a very short leaf stalk (0.5–1 mm long). The leaf veins are not visible, except the midrib which is raised on the underside of the leaf. The flowers are a purple-mauve colour with petals approximately 1 cm long. Sepals are 4–5 mm long, the anthers (pollen producing part of flower) have an appendage 0.6–0.9 mm long. The fruits are 1.5–1.8 mm long (Conn 2007).
Seaforth Mintbush is known from a single population in the Seaforth area, Sydney, in NSW. The population is fragmented into three sites over an area of 4 km² in the Manly and Warringah Local Government Areas (NSW SC 2008). The species has a total population of 90–130 plants with one plant in Garigal National Park and 80-100 plants in the largest population on private property (NSW SC 2008). Other populations may exist near known populations and could become evident following a fire event (NSW OEH 2013j).
Prior to 2001, the Seaforth Mintbush was considered extinct, and it was previously recorded in the Sydney Harbour region (Conn 2007) and on Mangrove Mountain, 100 km north of Sydney (Conn 1992). Early records from south of Sydney and the South Coast that were previously ascribed to this species have since been identified as Villous Mintbush (Prostanthera densa) (NSW SC 2008).
One site is within Garigal National Park and all sites are within, or in close proximity to, the Duffys Forest Ecological Community, listed as an endangered ecological community under the NSW TSC Act (NSW SC 2008).
Seaforth Mintbush occurs on deeply weathered clay-loam soils associated with ironstone and scattered shale lenses, a soil type which only occurs on ridge tops and has been extensively impacted by urbanisation (NSW SC 2008). The vegetation associate is Duffy's Forest ecological community (Conn et al. 2013) in woodland dominated by Silvertop Ash (Eucalyptus sieberi) and Red Bloodwood (Corymbia gummifera) (Conn 1992, 2007).
Seaforth Mintbush has been recorded flowering in spring (Conn 1992), although flowering may occur throughout much of the year (Conn 2007).
Seaforth Mintbush is fragmented by urbanisation into three small sites. Road widening and maintenance activities may threaten one site, golf course maintenance may threaten another site and the third site, within the Garigal National Park, is located very close to the park's boundary (NSW Scientific Comittee 2008). The species is also known to be threatened by (NSW OEH 2013j):
- stochastic events, such as wildfire, impacting the species limited range and low number of plants
- habitat degradation from adjacent land uses such as weed invasion, fertiliser and herbicide drift, storm water run-off and seepage, rubbish dumping and trampling
- inappropriate fire regimes, especially high frequency fire
- infection by Phytophthora cinnamomi
- encroachment of exotic turf grasses into habitat where the species occurs
- Loss of habitat from small scale clearing.
The response of the Seaforth Mintbush to fire is not known (Conn pers. comm. in NSW SC 2008) but given its small population size and fragmented nature, a single event, such as a wildfire, could represent a significant threat to the survival of the Seaforth Mintbush.
Management actions that may benefit the Seaforth Mintbush include (NSW OEH 2013j):
- actively managing sites to control threats, especially weeds, access and drainage
- implementation of an appropriate fire regime
- liaison with adjacent land managers to ensure management practices, including the use of fertilisers and herbicides, access and drainage, avoid or minimise impacts to known populations.
Management documents relevant to the Seaforth Mintbush are at the start of the profile.
No threats data available.
Conn, B.J (1992). Harden, G.J., ed. Flora of New South Wales (Lamiaceae). 3:650-51. Sydney, NSW: Royal Botanic Gardens.
Conn, B.J. (2007a). Prostanthera marifolia. NSW Flora Online. [Online]. National Herbarium of New South Wales. Sydney, Australia: Royal Botanic Gardens and Domain Trust. Available from: http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Prostanthera~marifolia.
Conn, B.J., T.C. Wilson, M.J. Henwood & K. Proft (2013). Circumscription and phylogenetic relationship of Prostanthera densa and P. marifolia (Lamiaceae). Telopea. 15:149-64.
Department of the Environment (2014a). Threat abatement plan for disease in natural ecosystems caused by Phytophthora cinnamomi. [Online]. Canberra; ACT: Department of the Environment. Available from: http://www.environment.gov.au/resource/threat-abatement-plan-disease-natural-ecosystems-caused-phytophthora-cinnamomi.
NSW Office of Environment and Heritage (NSW OEH) (2013j). Seaforth Mintbush - profile. [Online]. Available from: http://www.threatenedspecies.environment.nsw.gov.au/tsprofile/profile.aspx?id=20101.
NSW Scientific Committee (NSW SC) (2008). Prostanthera marifolia - critically endangered species listing - Final Determination. [Online]. NSW Department of Climate Change and Water. Available from: http://www.environment.nsw.gov.au/determinations/prostantheramarifoliafd.htm.
Warringah Council (n.d). Mint Bush. [Online]. Available from: http://www.warringah.nsw.gov.au/environment/documents/fact_sheet_mintbush.pdf.
This database is designed to provide statutory, biological and ecological information on species and ecological communities, migratory species, marine species, and species and species products subject to international trade and commercial use protected under the Environment Protection and Biodiversity Conservation Act 1999 (the EPBC Act). It has been compiled from a range of sources including listing advice, recovery plans, published literature and individual experts. While reasonable efforts have been made to ensure the accuracy of the information, no guarantee is given, nor responsibility taken, by the Commonwealth for its accuracy, currency or completeness. The Commonwealth does not accept any responsibility for any loss or damage that may be occasioned directly or indirectly through the use of, or reliance on, the information contained in this database. The information contained in this database does not necessarily represent the views of the Commonwealth. This database is not intended to be a complete source of information on the matters it deals with. Individuals and organisations should consider all the available information, including that available from other sources, in deciding whether there is a need to make a referral or apply for a permit or exemption under the EPBC Act.
Citation: Department of the Environment (2014). Prostanthera marifolia in Species Profile and Threats Database, Department of the Environment, Canberra. Available from: http://www.environment.gov.au/sprat. Accessed Sat, 20 Sep 2014 02:11:41 +1000.