Echinocactus horizonthalonius var. nicholii L.D.Benson, Cacti Ariz., ed. 3: 23. 1969

Echinocactus horizonthalonius var. nicholii L.D.Benson, Cacti Ariz., ed. 3: 23. 1969

Echinocactus horizonthalonius var. nicholii L.D.Benson, Cacti Ariz., ed. 3: 23. 1969

is basionym for Meyerocactus horizonthalonius subsp. nicholii (L.D.Benson) Doweld in Sukkulenty 1(2): 27. 1999

is basionym for Echinocactus horizonthalonius subsp. nicholii (L.D.Benson) U.Guzmán in Cactaceae Syst. Init. 16: 17. 2003

Taxon for this name

Echinocactus horizonthalonius var. nicholii L.D.Benson, Cacti Ariz., ed. 3: 23. 1969