As classified in WFO snapshot
December 2023
Warning: older classification
variety
Echinocactus setispinus var. muehlenpfordtii
(J.H.Fennell) J.M.Coult.
This variety name was first published in in Contr. U.S. Natl. Herb. 3: 370. 1896.
This variety name has been reclassified since this snapshot. Its current preferred usage is a synonym .