Espostoa melanostele f. inermis (Backeb.) Krainz, Kakteen 26: C Va. 1964 Espostoa melanostele f. inermis (Backeb.) Krainz, Kakteen 26: C Va. 1964is new combination for Pseudoespostoa melanostele var. inermis Backeb. in Cact. Succ. J. (Los Angeles) 23: 149. 1951Taxon for this nameEspostoa melanostele f. inermis (Backeb.) Krainz