Aztekium valdezii Holotype: Mexico, locality withheld for conservation reasons, alt. 60 – 700 m, Apr 2009, Valdéz Marroquin & al. 001 (UNL) Isotype: Mexico, locality withheld for conservation reasons, alt. 60 – 700 m, Apr 2009, Valdéz Marroquin & al. 001 (MEXU) Isotype: Mexico, locality withheld for conservation reasons, alt. 60 – 700 m, Apr 2009, Valdéz Marroquin & al. 001 (ANSM)