⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record kew-2772858, and has not been changed.

Discocactus zehntneri var. horstiorum P.J.Braun is a synonym of Discocactus zehntneri subsp. boomianus (Buining & Brederoo) N.P.Taylor & Zappi

The record derives from WCSP (in review) which reports it as a synonym with original publication details: Succulenta (Netherlands) 69: 218 1990.