Acianthus ledwardii Rupp (1938:113)



Taxonomy & Nomenclature

Invalid (synonym)


"Very close to A.fornicatus, which is remains common in coastal heath remnants in the Burleigh Heads area; A.ledwardii is treated as a synonym of A.fornicatus in AVH and ALA, as it is difficult to justify recognition of A. ledwardii on morphological grounds alone (DNA sequencing may shed further light on this)"

(Silcock et al., 2019:SM:1)


Conservation Status

Rediscovered prior to reduction to synonymy. Though (Humphreys et al., 2019:SD1) considers the species as valid and rediscovered.

Last record: 1934 (Silcock et al., 2019:SM:1)

Rediscovered in (year?) (Kores, 1995)



Queensland (& New South Wales?), Australia


Biology & Ecology










Original scientific description:

Rupp, H. M. R. (1938). A new orchid for south Queensland Acianthus Ledwardii, sp. nov. The Queensland Naturalist 10(6): 111-113.


Other references:

Hnatiuk, R. J. (1990). Census of Australian vascular plants. Australian Flora and Fauna Series 11: 1-650.

Humphreys, Aelys M., Govaerts, Rafaël, Ficinski, Sarah Z., Lughadha, Eimear Nic and Vorontsova, Maria S. (2019). Global dataset shows geography and life form predict modern plant extinction and rediscovery. Nature Ecology & Evolution 3: 1043-1047. [Supplementary Dataset 1]

Kores, P. J. (1995). A systematic study of the genus Acianthus (Orchidaceae: Diurideae). Allertonia 7(3): 87-220 [199-203].

Silcock, Jen L., Field, Ashley R., Walsh, Neville G. and Fensham, Roderick J. (2019). To name those lost: assessing extinction likelihood in the Australian vascular flora. Oryx 54(2): 167-177. [Supplementary Material]

Walter, Kerry S. and Gillett, Harriet J. (eds.). (1998). 1997 IUCN Red List of Threatened Plants. Compiled by the World Conservation Monitoring Centre. Gland, Switzerland & Cambridge, UK: IUCN – The World Conservation Union. lxiv + 862 pp.


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