Pyrrhocactus horridus (Colla) Backeb. Kaktus-ABC: 264. 1936.

Nomenclatural References

• person : Curt Backeberg (1894-1966) Based on occurrence of standard abbreviation 'Backeb.' in the authors string.
• person : Luigi Aloysius Colla (1766-1848) Based on occurrence of standard abbreviation 'Colla' in the authors string.
• database : The Plant List version 1.0, record: kew-2413773
• database : The Plant List version 1.1, record: kew-2413773