Desfontaines, R.L. (1799), Flora Atlantica 2: 245 [tax. nov.]

Nyman, C.F. (October 1879), Conspectus Florae Europaeae 2: 411 [basionym]

basionym of: Carduus nutans subsp. macrocephalus (Desf.) Nyman nom. illeg.

Boivin, J.R.B (1972), Flora of the Prairie Provinces, Part III, (continued). Phytologia 23(1): 111 [basionym]

basionym of: Carduus nutans var. macrocephalus (Desf.) B.Boivin legitimate

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

nomenclatural synonym: Carduus nutans subsp. macrocephalus (Desf.) Nyman nom. illeg.

Council of Heads of Australasian Herbaria (2011), Australian Plant Census: - [nomenclatural synonym]

nomenclatural synonym of: Carduus nutans var. macrocephalus (Desf.) B.Boivin 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: - [doubtful taxonomic synonym]

doubtful taxonomic synonym of: Carduus nutans L. legitimate

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