Rapicactus booleanus Holotype, holotype: Mexico, Nuevo León, Galeana, "Y" Griega, 1 Mar 1992, G.S. Hinton 21805 (TEX: TEX00031178) Isotype: Mexico, Nuevo León, Galeana, "Y" Griega, 1 Mar 1992, G.S. Hinton 21805 (ASU: ASU0019119) Isotype: Mexico, Nuevo León, Galeana, "Y" Griega, 1 Mar 1992, G.S. Hinton 21805 (GBH: GBH021805) Isotype: Mexico, Nuevo León, Galeana, "Y" Griega, 1 Mar 1992, G.S. Hinton 21805 (ANSM: ANSM064098) Isotype: Mexico, Nuevo León, Galeana, "Y" Griega, 1 Mar 1992, G.S. Hinton 21805 (IEB: IEB000146485)