Bolus, H. & Wolley-Dod, A.H. (1904), A list of the floweirng plants and ferns of the Cape Peninsula, with notes on some of the critical species. Transactions of the South African Philosophical Society 14: 289 [comb. nov.]

basionym: Stobaea rigida Thunb. legitimate

Hartley, W. (1953), Standardized Plant Names: a revised list of standard common names for the more important Australian grasses, other pasture plants, and weeds. Bulletin (CSIRO) 272: 16 [secondary reference]

Black, J.M. & Robertson, E.L. (1957), Flora of South Australia Edn. 2, 4: 891 [secondary reference]

nomenclatural synonym: Stobaea rigida Thunb. legitimate common name: African Thistle [n/a]

Green, J.W. (1985), Census of the Vascular Plants of Western Australia Edn. 2: 163 [secondary reference]

Lander, N.S. in Marchant, N.G., Wheeler, J.R., Rye, B.L., Bennett, E.M., Lander, N.S. & Macfarlane, T.D. (1987), Asteraceae. Flora of the Perth Region 2: 661-662 [secondary reference]

common name: African Thistle [n/a] common name: Hamelin Thistle [n/a]

Jeanes, J.A. in Walsh, N.G. & Entwisle, T.J. (ed.) (1999), Asteraceae. Flora of Victoria 4: 719, Fig. 138g [secondary reference]

nomenclatural synonym: Stobaea rigida Thunb. legitimate common name: African Thistle [n/a]

Wheeler, J.R., Marchant, N.G. & Lewington, M. (2002), Dicotyledons. Flora of the South West 2: 496 [secondary reference]

common name: African Thistle [n/a] common name: Hamelin Thistle [n/a]

Ghafoor, A. in Wilson, A.J.G. (ed.) (2015), Berkheya. Flora of Australia 37: 168-170, Fig. 17a-d, map [secondary reference]

nomenclatural synonym: Stobaea rigida Thunb. legitimate misapplication: Berkheya carduiformis DC. legitimate by Gardner, C.A. (1929), Journal of the Department of Agriculture, Western Australia ser. 2 6: 3 misapplication: Berkheya carduoides (Less.) Hutch. legitimate by Gardner, C.A. (May 1931), Part III. Geraniaceae–Compositae. Enumeratio Plantarum Australiae Occidentalis: 138 common name: African Thistle [n/a] common name: Hamelin Thistle [n/a]

Council of Heads of Australasian Herbaria (2016), Australian Plant Census: - APC [secondary reference]

nomenclatural synonym: Stobaea rigida Thunb. legitimate isonym: Berkheya rigida (Thunb.) Ewart, Jean White & B.Rees isonym misapplication: Berkheya carduiformis DC. legitimate by Gardner, C.A. (1929), Journal of the Department of Agriculture, Western Australia ser. 2 6: 3 misapplication: Berkheya carduoides (Less.) Hutch. legitimate by Gardner, C.A. (May 1931), Part III. Geraniaceae–Compositae. Enumeratio Plantarum Australiae Occidentalis: 138

• APC Dist.: WA (naturalised), SA (naturalised), Vic (naturalised), Tas (naturalised)

de Salas, M.F. & Baker, M.L. (2016), A Census of the Vascular Plants of Tasmania, including Macquarie Island: 10 [secondary reference]

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