Pfeiffer, L.K.G. (1838), Abbildungen und Beschreibung bluhender Cacteen 1: t. 4 [comb. nov.]

basionym: Echinocactus oxygonus Link legitimate

Jessup, L.W. (2003), Flora of South-eastern Queensland Volume 1 Changes to names or status of taxa: - [secondary reference]

taxonomic synonym: Echinopsis multiplex (Pfeiff.) Zucc. ex Pfeiff. & Otto legitimate

Council of Heads of Australasian Herbaria (2005), Australian Plant Census: - APC [secondary reference]

taxonomic synonym: Echinopsis multiplex (Pfeiff.) Zucc. ex Pfeiff. & Otto legitimate

• APC Dist.: SA (doubtfully naturalised), Qld (doubtfully naturalised)

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