Biodiversity

Species Profile and Threats Database


For information to assist proponents in referral, environmental assessments and compliance issues, refer to the Policy Statements and Guidelines (where available), the Conservation Advice (where available) or the Listing Advice (where available).
 
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 Endangered as Acacia pygmaea
Listing and Conservation Advices Commonwealth Conservation Advice on Acacia pygmaea (Dwarf Rock Wattle) (Threatened Species Scientific Committee, 2008hb) [Conservation Advice].
 
Recovery Plan Decision Recovery Plan not required, included on the Not Commenced List (1/11/2009).
 
Adopted/Made Recovery Plans
Federal Register of
    Legislative Instruments
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] as Acacia pygmaea.
 
State Government
    Documents and Websites
WA:Threatened flora of the Western Central Wheatbelt (Collins, J., 2009) [State Species Management Plan].
WA:Dwarf Rock Wattle (Acacia pygmaea) Interim Recovery Plan (Holland, E., K. Kershaw & A. Brown, 1997) [State Recovery Plan].
WA:Declared Rare and Poorly Known Flora Largely Restricted to the Shire of Wongan-Ballidu (Stack, G., N. Willers, M. Fitzgerald & A. Brown, 2006) [State Species Management Plan].
State Listing Status
WA: Listed as Endangered (Wildlife Conservation Act 1950 (Western Australia): September 2013 list) as Acacia pygmaea
Scientific name Acacia pygmaea [56768]
Family Fabaceae:Fabales:Magnoliopsida:Magnoliophyta:Plantae
Species author Maslin
Infraspecies author  
Reference Nuytsia 10: 99 (1995).
Other names Acacia pygmaea Maslin ms. [67261]
Distribution map Species Distribution Map

This is an indicative distribution map of the present distribution of the species based on best available knowledge. See map caveat for more information.

Illustrations Google Images

The Dwarf Rock Wattle is an erect single stemmed shrub (Maslin 1995a; Paczkowska & Chapman 2000), 0.3-0.7 m high (Brown et al. 1998; Orchard & Wilson 2001) with globular flower heads that are cream/white, ageing to orange (Orchard & Wilson 2001).

Known only from the Wongan Hills area, 200 km NE of Perth, in SW WA (Maslin 1995a; Holland et al. 1997; Brown et al. 1998). It is found on three adjacent ridges (Orchard & Wilson 2001) around Mt Matilda and Mt O'Brien, representing a geographic range of 8 km (Holland et al. 1997; Brown et al. 1998).

Only a few populations are known despite numerous searches and an abundance of suitable habitat. It occurs in Mt Matilda NR, Rogers NR and on private property (Brown et al. 1998). In 1995, the total number of individual plants was less than 50 (Maslin 1995a), while in 1997 the total known population was 129 plants (Holland et al. 1997).

Summary of population details as in Holland et al. (1997):

Population no.LocationLand TenureYear of survey - no. of plantsComments
1aMt Matildaprivate land1980 - 25 plants
1991 - 57 plants
good condition
1bMt Matilda NRnature reserve1996 - 71 plantsgood condition
2aMt Matildaprivate land1991 - 15 plants
1995 - 16 plants
good condition
2bMt Matilda NRnature reserve1995 - 3 plantsgood condition
3Mt Matilda NRnature reserve1995 - 6 plantsgood condition
4Mt O'Brienprivate land1996 - 5 plantsgood condition
5Rogers NR,NW of Wongan Hillsnature reserve1996 - 28 plantsgood condition

The taxon was previously known as Acacia sp. Wongan Hills (Brown et al. 1998).

This species is confined to the ridges of lateritic breakaways (Brown et al. 1998) but does not extend down laterite scree slopes (Maslin 1995a). Individuals grow in rock crevices (Brown et al. 1998), with their roots presumably reaching the underlying clay (Holland et al. 1997).

It grows in open E. ebbanoensis mallee over open heath (Holland et al. 1997; Brown et al. 1998) of Allocasuarina campestris, Dryandra comosus, D. hewardiana, D. pulchella and Persoonia divergens (Maslin 1995a; Holland et al. 1997).

The species flowers from about Nov. to Mar. (Orchard & Wilson 2001). Seed has been collected in late Oct. (Maslin 1995a).

Flowers are probably insect pollinated (Rye 1980 in Holland et al. 1997). The species produces relatively few fruits (Rye 1980 in Holland et al. 1997; Brown et al. 1998). Each pod contains just 2-3 seeds (Rye 1980 in Holland et al. 1997). Most acacias fruit and shed their seed a short time after flowering. The pods of this species take nearly a year to mature. Flower buds and unopened pods may be found on the plant simultaneously (Holland et al. 1997).

The following table lists known and perceived threats to this species. Threats are based on the International Union for Conservation of Nature and Natural Resources (IUCN) threat classification version 1.1.

Threat Class Threatening Species References
Ecosystem/Community Stresses:Indirect Ecosystem Effects:Restricted geographical distribution (area of occupancy and extent of occurrence) Acacia pygmaea in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage (DEH), 2006ap) [Internet].
Invasive and Other Problematic Species and Genes:Invasive Non-Native/Alien Species:Competition and/or habitat degradation by weeds Commonwealth Conservation Advice on Acacia pygmaea (Dwarf Rock Wattle) (Threatened Species Scientific Committee, 2008hb) [Conservation Advice].
Invasive and Other Problematic Species and Genes:Invasive and Other Problematic Species and Genes:Predation, competition, habitat degradation and/or spread of pathogens by introduced species Commonwealth Conservation Advice on Acacia pygmaea (Dwarf Rock Wattle) (Threatened Species Scientific Committee, 2008hb) [Conservation Advice].
Natural System Modifications:Fire and Fire Suppression:Inappropriate and/or changed fire regimes (frequency, timing, intensity) Acacia pygmaea in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage (DEH), 2006ap) [Internet].
Natural System Modifications:Fire and Fire Suppression:Inappropriate prescribed regimes and/or vegetation management to control fire regimes Species threats data recorded on the SPRAT database between 1999-2002 (Department of Sustainability, Environment, Water, Population and Communities (DSEWPaC), 2012i) [Database].

Brown, A., C. Thomson-Dans & N. Marchant, eds. (1998). Western Australia's Threatened Flora. Como, Western Australia: Department of Conservation and Land Management.

Holland, E., K. Kershaw & A. Brown (1997). Dwarf Rock Wattle (Acacia pygmaea) Interim Recovery Plan. Wanneroo, WA; CALM.

Maslin, B R (1995a). Acacia Miscellany 12. Acacia myrifolia (Leguminosae:Mimosoideae: section Phyllodineae) and its allies in Western Australia. Nuytsia. 10(1):85-101.

Orchard, A.E. & A.J.G. Wilson (eds) (2001). Flora of Australia, Volume 11A, Mimosaceae, Acacia Part 1.

Paczkowska, G. & A.R. Chapman (2000). The Western Australian Flora, A Descriptive Catalogue. The Wildflower Society of Western Australia (Inc.), the Western Australian Herbarium, Department of Conservation and Land Management and the Botanic Gardens & Parks Authority.

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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). Acacia pygmaea in Species Profile and Threats Database, Department of the Environment, Canberra. Available from: http://www.environment.gov.au/sprat. Accessed Tue, 22 Jul 2014 18:22:22 +1000.