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 Extinct
Adopted/Made Recovery Plans
Policy Statements and Guidelines Draft survey guidelines for Australia's threatened orchids (Department of the Environment, 2013b) [Admin Guideline].
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].
Scientific name Acianthus ledwardii [11200]
Family Orchidaceae:Orchidales:Liliopsida:Magnoliophyta:Plantae
Species author Rupp
Infraspecies author  
Reference The Queensland Naturalist 10 (Aug. 1938) 113, & Plate.
Distribution map Species Distribution Map not available for this taxon.
Illustrations Google Images

Scientific name: Acianthus ledwardii

Acianthus ledwardii closely resembled A. fornicatus except for the following differences: the lateral sepals were linear and parallel (not divergent as in A. fornicatus); the dorsal sepal terminated in a short, sharp point; petals were short and broad (narrow in A. fornicatus); and the labellum (lip) was convex below (as opposed to concave in Acianthus fornicatus) (Rupp 1938).

Acianthus ledwardii was a small orchid, growing to about 5 cm high. The leaves were pale green on the upper side. The species possessed two to six flowers which ranged in colour from deep purple to reddish brown. The short, broad petals were lance-shaped. The labellum (or lip), which attracts insects and acts as a landing platform, was egg-shaped with a finely serrated margin (Rupp 1938).

The type specimen was collected from Burleigh Heads, south-east Queensland, in 1934 and again in 1938 (Rupp 1938), but has not been recorded since (APNI 2001).

The threatening processes that led to decline and extinction of Acianthus ledwardii are unknown.

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
Uncategorised:Uncategorised:threats not specified Acianthus ledwardii in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage, 2006aj) [Internet].

Australian Plant Names Index APNI (2001). Australian Plant Names Index. [Online]. Australian National Botanic Gardens. Available from:

Rupp, H.M.R. (1938). A new orchid for South Queensland: Acianthus ledwardii, sp. nov. The Queensland Naturalist. 10(6):113-114.

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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). Acianthus ledwardii in Species Profile and Threats Database, Department of the Environment, Canberra. Available from: Accessed Wed, 17 Sep 2014 10:11:57 +1000.