Echinocactus platensis var. guerkeanus (Heese) Speg. in Anales Mus. Nac. Buenos Aires, ser. 3, 4: 504. 1905
Echinocactus platensis var. guerkeanus in Anales Mus. Nac. Buenos Aires, ser. 3, 4: 504. 1905
is new combination for Echinocactus guerkeanus in Monatsschr. Kakteenk. 21: 132. 1911