Nyman, C.F. (October 1879), Conspectus Florae Europaeae 2: 411 [nom. et stat. nov.]

basionym: Carduus macrocephalus Desf. legitimate

Jacobs, S.W.L. & Pickard, J. (1981), Plants of New South Wales: 74 [nomenclatural synonym]

nomenclatural synonym of: Carduus macrocephalus Desf. legitimate

Bean, A.R. in Wilson, A.J.G. (ed.) (2015), Asteraceae Subfam. 2. Carduoideae Trib. 1. Cardueae. Flora of Australia 37: 52 [doubtful taxonomic synonym]

doubtful taxonomic synonym of: Carduus nutans L. legitimate

Council of Heads of Australasian Herbaria (31 July 2018), Australian Plant Census: - [secondary reference]

orthographic variant: Carduus nutans subsp. acrocephalus N.C.W.Beadle orth. var.

Council of Heads of Australasian Herbaria (31 July 2018), Australian Plant Census: - [doubtful taxonomic synonym]

doubtful taxonomic synonym of: Carduus nutans L. legitimate

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