Cleistocactus horstii P.J.Braun in Kakteen And. Sukk. 33: 208. 1982
Cleistocactus horstii in Kakteen And. Sukk. 33: 208. 1982
is basionym for Cleistocactus baumannii subsp. horstii in Cactaceae Consensus Init. 6: 15. 1998
is basionym for Echinopsis horstii in Cactusinhabitat S. Amer. 2011/2013: 38. 2013