Berlandier - s.n. - Mexico
Boufford - 10443 - United States
Echinocactus texensis
Engelmann - s.n. - United States
Ferris - 3142 - United States
Hall - 233 - United States
HESS - 9369 - United States
Lindheimer - s.n. - United States
Wislizenus - s.n. - Mexico