Parodia ottonis subsp. horstii (F.Ritter) Hofacker in Cactaceae Consensus Init. 6: 12. 1998
Parodia ottonis subsp. horstii in Cactaceae Consensus Init. 6: 12. 1998
is new combination for Notocactus arechavaletae var. horstii, Kakteen Südamerika 1: 166. 1979
Parodia ottonis subsp. horstii in Cactaceae Consensus Init. 6: 12. 1998