Echinocactus violaciflorus (Quehl) Britton & Rose = Stenocactus dichroacanthus subsp. violaciflorus (Quehl) U. Guzmán & Vazq.-Ben.
English:
violaciflorus,-a,-um;

https://archive.org/stream/cactaceaedescri03brit#page/114/mode/2up
homotypic synonyms:
Echinocactus violaciflorus Quehl; Echinofossulocactus violaciflorus (Quehl) Britton & Rose; Stenocactus violaciflorus (Quehl) A. Berger ex A.W. Hill;

protologue: Cactaceae 3: 114 (1922)

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