Taxonomic status: Unresolved

homotypic synonyms:
Echinocactus tetracanthus Lemaire; Notocactus tetracanthus (Lemaire) N.Gerloff, Neduchal & S.Stuchlik;

protologue: Monatsschr. Kakteenk. 4: 143 (1894) [url checked 20180118]

URL protologue: https://archive.org/stream/monatsschriftf1894schu#page/143/mode/1up

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