Echinocactus williamsii var. luteus Rouhier in Trav. Lab. Matiere Méd. Ecole Super. Pharm. Paris 17: 62. 1927
Echinocactus williamsii var. luteus in Trav. Lab. Matiere Méd. Ecole Super. Pharm. Paris 17: 62. 1927
is basionym for Lophophora lutea, Cactaceae 5: 1901. 1961
is basionym for Lophophora echinata var. lutea in Desert Pl. Life 16: 44. 1944
is basionym for Lophophora williamsii var. lutea, Cact. Mèd.: 121. 1948