Ariocarpus fissuratus subsp. hintonii (Stuppy & N.P. Taylor) Halda Ariocarpus fissuratus subsp. hintonii (Stuppy & N.P. Taylor) Halda in Acta Mus. Richnov., Sect. Nat., 5: 36. 1998 sec. Guzmán & al. 2003≡Ariocarpus fissuratus var. hintonii Stuppy & N.P. Taylor in Bradleya 7: 84. 1989 syn. sec. Guzmán & al. 2003