Franco, J.M.A. do A. (1975), Botanical Journal of the Linnean Society 75(1): 45 [autonym]

Murray, L. in Harden, G.J. (ed.) (1992), Onopordum. Flora of New South Wales 3: 324 [secondary reference]

common name: Scotch Thistle [n/a]

Jeanes, J.A. in Walsh, N.G. & Entwisle, T.J. (ed.) (1999), Asteraceae. Flora of Victoria 4: 668, Fig. 128d [secondary reference]

common name: Heraldic Thistle [n/a]

CHAH (2014), Australian Plant Census: - [nomenclatural synonym]

nomenclatural synonym of: Onopordum acanthium L. legitimate

CHAH (2016), Australian Plant Census: - [nomenclatural synonym]

nomenclatural synonym of: Onopordum acanthium L. legitimate

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