⚠ Version 1 of The Plant List has been superseded.

This name record (from Tropicos) is not included in version 1.1 of The Plant List. It is possible the same name is included from a different data source, to check this you can search for Acanthocalycium thionanthum in version 1.1 of The Plant List.

Acanthocalycium thionanthum var. brevispinum (F. Ritter) Donald is a synonym of Echinopsis thionantha (Speg.) D.R.Hunt

This name is a synonym of Echinopsis thionantha (Speg.) D.R.Hunt.

The record derives from Tropicos which reports it as a synonym (record 50122277) with original publication details: Ashingtonia 1: 124 124 1975.