Echinocactus horizonthalonius f. obscurispinus (Rud.Mey.) Schelle
, Kakteen (Schelle) 186 (1926).
External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:87441-2
- Publication
- Kakteen kurze Beschreibung....[Schelle]
- Collation
- 186
- Family as entered in IPNI
- Cactaceae