Ariocarpus trigonus var. elongatus (Salm-Dyck) Backeb., Cactaceae 5: 3087. 1961 Ariocarpus trigonus var. elongatus (Salm-Dyck) Backeb., Cactaceae 5: 3087. 1961is new combination for Anhalonium elongatum Salm-Dyck, Cact. Hort. Dyck., ed. 1844: 15. 1845Taxon for this nameAriocarpus trigonus var. elongatus (Salm-Dyck) Backeb.