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
Recovery Plan Decision Recovery Plan required, this species had a recovery plan in force at the time the legislation provided for the Minister to decide whether or not to have a recovery plan (19/2/2007).
 
Adopted/Made Recovery Plans Scott River Boronia Boronia exilis Interim Recovery Plan 1999-2002. Interim Recovery Plan No 39 (Evans R., G. Stack & V. English, 1999) [Recovery Plan].
 
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].
 
State Government
    Documents and Websites
WA:Interim Recovery Plan. No. 173. Scott River Boronia (Boronia exilis) Interim Recovery Plan 2004-2009 (Western Australia Department of Environment and Conservation (WA DEC), 2004a) [State Recovery Plan].
WA:Declared Rare and Poorly Known Flora in the Central Forest Region. Part 2 (Williams, K., A. Horan, S. Wood & A. Webb, 2001) [State Species Management Plan].
State Listing Status
WA: Listed as Endangered (Wildlife Conservation Act 1950 (Western Australia): September 2013 list)
Scientific name Boronia exilis [64844]
Family Rutaceae:Sapindales:Magnoliopsida:Magnoliophyta:Plantae
Species author P.G.Wilson
Infraspecies author  
Reference Nuytsia 12(1): 134, fig. 5 (1998).
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 Scott River Boronia is an erect slender-stemmed perennial 1 m high with pale pink or white flowers (Brown et al. 1998; Wilson 1998e).

Known only from a few sites over a small area, in the Scott R. area of extreme south-western WA (Wilson 1998e; Brown et al. 1998). A search in Sept. 1996 found only one of the three populations known at that time (Brown et al. 1998). In 1999, five populations, one with three subpopulations, were located (Evans et al. 1999).

Details of populations as in Evans et al. (1999):

PopulationLand StatusPop. sizeCondition
1a. Brennan BridgeShire road reserve100 plants in 1996habitat is healthy
1b. Brennan BridgeShire reserveunknownhabitat is healthy
1c. Brennan BridgeShire reserveunknownhabitat is healthy
2. NNE of AugustaNational Parkunknownunknown habitat condition
3. NE of AugustaNature Reserveunknown unknown habitat condition
4. NE of AugustaPrivate propertyunknown unknown habitat condition
5. NE of AugustaState Forestunknownunknown habitat condition

The species occurs in seasonally wet heath or sedgeland, on grey silty sands on ironstone soils, a habitat of limited extent in the Scott R. area (Evans et al. 1999). It grows with other Boronia species, Beaufortia sparsa and several species of Adenanthos (Brown et al. 1998; Wilson 1998e).

The habitat at Population 4 is described as low Banksia attenuata, B. ilicifolia and Eucalyptus marginata woodland, over mixed Proteaceae and Myrtaceae scrub, and low sedgeland with pockets of low open Proteaceae and Myrtaceae heath (Williams et al. 1999 in Evans et al. 1999).

Flowers are borne in Sept. (Brown et al. 1998; Wilson 1998e). The fragrant flowers may be pollinated by moths and other insects (Evans et al. 1999).

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
Biological Resource Use:Gathering Terrestrial Plants:Commercial harvest Scott River Boronia Boronia exilis Interim Recovery Plan 1999-2002. Interim Recovery Plan No 39 (Evans R., G. Stack & V. English, 1999) [Recovery Plan].
Ecosystem/Community Stresses:Indirect Ecosystem Effects:Restricted geographical distribution (area of occupancy and extent of occurrence) Scott River Boronia Boronia exilis Interim Recovery Plan 1999-2002. Interim Recovery Plan No 39 (Evans R., G. Stack & V. English, 1999) [Recovery Plan].
Energy Production and Mining:Mining and Quarrying:Habitat destruction, disturbance and/or modification due to mining activities Scott River Boronia Boronia exilis Interim Recovery Plan 1999-2002. Interim Recovery Plan No 39 (Evans R., G. Stack & V. English, 1999) [Recovery Plan].
Energy Production and Mining:Mining and Quarrying:Habitat modification through open cut mining/quarrying activities Scott River Boronia Boronia exilis Interim Recovery Plan 1999-2002. Interim Recovery Plan No 39 (Evans R., G. Stack & V. English, 1999) [Recovery Plan].
Declared Rare and Poorly Known Flora in the Central Forest Region. Part 2 (Williams, K., A. Horan, S. Wood & A. Webb, 2001) [State Species Management Plan].
Human Intrusions and Disturbance:Recreational Activities:Disturbance, especially from human recreational activities and development Scott River Boronia Boronia exilis Interim Recovery Plan 1999-2002. Interim Recovery Plan No 39 (Evans R., G. Stack & V. English, 1999) [Recovery Plan].
Declared Rare and Poorly Known Flora in the Central Forest Region. Part 2 (Williams, K., A. Horan, S. Wood & A. Webb, 2001) [State Species Management Plan].
Human Intrusions and Disturbance:Recreational Activities:Soil disturbance and/or trampling due to bushwalking Scott River Boronia Boronia exilis Interim Recovery Plan 1999-2002. Interim Recovery Plan No 39 (Evans R., G. Stack & V. English, 1999) [Recovery Plan].
Invasive and Other Problematic Species and Genes:Invasive Non-Native/Alien Species:Competition and/or habitat degradation by weeds Scott River Boronia Boronia exilis Interim Recovery Plan 1999-2002. Interim Recovery Plan No 39 (Evans R., G. Stack & V. English, 1999) [Recovery Plan].
Invasive and Other Problematic Species and Genes:Invasive Non-Native/Alien Species:Vegetation and habitat loss caused by dieback Phytophthora cinnamomi Scott River Boronia Boronia exilis Interim Recovery Plan 1999-2002. Interim Recovery Plan No 39 (Evans R., G. Stack & V. English, 1999) [Recovery Plan].
Declared Rare and Poorly Known Flora in the Central Forest Region. Part 2 (Williams, K., A. Horan, S. Wood & A. Webb, 2001) [State Species Management Plan].
Natural System Modifications:Fire and Fire Suppression:Inappropriate and/or changed fire regimes (frequency, timing, intensity) Scott River Boronia Boronia exilis Interim Recovery Plan 1999-2002. Interim Recovery Plan No 39 (Evans R., G. Stack & V. English, 1999) [Recovery Plan].
Natural System Modifications:Fire and Fire Suppression:Inappropriate prescribed regimes and/or vegetation management to control fire regimes Scott River Boronia Boronia exilis Interim Recovery Plan 1999-2002. Interim Recovery Plan No 39 (Evans R., G. Stack & V. English, 1999) [Recovery Plan].
Species Stresses:Indirect Species Effects:Low numbers of individuals Scott River Boronia Boronia exilis Interim Recovery Plan 1999-2002. Interim Recovery Plan No 39 (Evans R., G. Stack & V. English, 1999) [Recovery Plan].
Declared Rare and Poorly Known Flora in the Central Forest Region. Part 2 (Williams, K., A. Horan, S. Wood & A. Webb, 2001) [State Species Management Plan].
Transportation and Service Corridors:Transportation and Service Corridors:Road and rail maintenance works Scott River Boronia Boronia exilis Interim Recovery Plan 1999-2002. Interim Recovery Plan No 39 (Evans R., G. Stack & V. English, 1999) [Recovery Plan].

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

Evans R., G. Stack & V. English (1999). Scott River Boronia Boronia exilis Interim Recovery Plan 1999-2002. Interim Recovery Plan No 39. [Online]. WA Threatened Species and Communities Unit. Wanneroo, WA; CALM. Available from: http://www.environment.gov.au/biodiversity/threatened/publications/recovery/b-exilis/index.html.

Wilson, Paul G. (1998e). New names and new taxa in the genus Boronia (Rutaceae) from Western Australia, with notes on seed characters. Nuytsia. 12(1):119-154.

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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). Boronia exilis in Species Profile and Threats Database, Department of the Environment, Canberra. Available from: http://www.environment.gov.au/sprat. Accessed Sun, 27 Jul 2014 05:27:54 +1000.