Thelocactus knuthianus (Boed.) Borg, Cacti, ed. 1: 284. 1937
Thelocactus knuthianus, Cacti, ed. 1: 284. 1937
is new combination for Echinocactus knuthianus in Monatsschr. Deutsch. Kakteen-Ges. 2: 139. 1930
Thelocactus knuthianus, Cacti, ed. 1: 284. 1937
Taxon for this name