Pediocactus simpsonii var. knowltonii (L.D.Benson) Halda
, Acta Mus. Richnov., Sect. Nat. 5(1): 13 (1998): (1998).
External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:1006297-1
- Publication
- Acta Musei Richnoviensis Sect. Nat.
- Collation
- 5(1): 13 (1998):
- Date of Publication
- 1998
- Family as entered in IPNI
- Cactaceae