Mammillaria elegans var. nigrispina Borg, Cacti, ed. 1: 336. 1937 Mammillaria elegans var. nigrispina Borg, Cacti, ed. 1: 336. 1937is basionym for Neomammillaria neoelegans var. nigrispina (Borg) Y.Itô, Cactaceae: 583. 1981Taxon for this nameMammillaria elegans var. nigrispina Borg