As classified in WFO snapshot
June 2025
latest classification for this taxon
variety
Echinocactus williamsii var. luteus
Rouhier
This variety name was first published in in Trav. Lab. Matiere Méd. Ecole Super. Pharm. Paris 17: 62. 1927.
This variety name has been reclassified since this snapshot. Its current preferred usage is a synonym .