Ariocarpus trigonus (F.A.C. Weber) K. Schum. in Bot. Jahrb. Syst. 24: 550. 1898 sec. Hunt 2016
- ≡Anhalonium trigonum F.A.C. Weber, Dict. horticult. 1: 90. 1893 syn. sec. Hunt & al. 2006
- =Ariocarpus trigonus var. minor Voldan in Kaktusy (Brno) 12: 3-6. 1976 syn. sec. Guzmán & al. 2003
- =Ariocarpus retusus subsp. trigonus (F.A.C. Weber) E.F. Anderson & W.A. Fitz Maur. in Haseltonia 5: 18. 1997 ["1998"] syn. sec. Hunt & al. 2006
- =Ariocarpus trigonus var. horacekii Halda, Cactaceae etc. 7: 1997 syn. sec. Guzmán & al. 2003
- =Ariocarpus elongatus subsp. horacekii (Halda) Halda in Acta Mus. Richnov., Sect. Nat., 5: 36. 1998 syn. sec. Guzmán & al. 2003