Coryphantha longicornis Boed. Coryphantha longicornis Boed. in Monatsschr. Deutsch. Kakteen-Ges. 3: 249. 1931 sec. Hunt 2016=Coryphantha grandis L. Bremer in Cact. Succ. J. (Los Angeles) 50: 134. 1978 syn. sec. Guzmán & al. 2003