Pediocactus Greek : πεδίον (pedion) means "plain", "flat", "field") is a genus of cacti. The genus comprises between 6 and 11 species, depending upon the authority. Species of this genus are referred to as hedgehog cacti, though that name is also applied to plants from the genera Echinocereus Echinopsis
The genus has 3 synonyms:
Navajoa Croizat Pilocanthus B.W.Benson & Backeb. Utahia Britton & Rose Sclerocactus Pediocactus were also at one time reduced to synonymy, but this is not at present considered to be correct.
Edward Frederick Anderson , (2005)
Pediocactus bradyi L.D.Benson Pediocactus despainii S.L.Welsh & Goodrich Pediocactus hermannii W.T.Marshall Pediocactus knowltonii L.D.Benson Pediocactus paradinei B.W.Benson Pediocactus peeblesianus (Croizat) L.D.Benson Pediocactus simpsonii (Engelm.) Britton & Rose Pediocactus simpsonii var. minor (Engelm.) L.D.Benson Pediocactus simpsonii var. robustior (J.M.Coult.) L.D.Benson Pediocactus simpsonii var. simpsonii Pediocactus winkleri K.D.Heil
David Richard Hunt, New Cactus Lexicon , (2006)
* Pediocactus bradyi L.D.Benson Pediocactus bradyi subsp. bradyi Pediocactus bradyi subsp. despainii (S.L.Welsh & Goodrich) Hochstätter Pediocactus bradyi subsp. winkleri (K.D.Heil) Hochstätter Pediocactus knowltonii L.D.Benson Pediocactus nigrispinus (Hochstätter) Hochstätter Pediocactus paradinei B.W.Benson Pediocactus peeblesianus (Croizat) L.D.Benson Pediocactus peeblesianus subsp. fickeiseniorum (Hochstätter) Lüthy Pediocactus peeblesianus subsp. peeblesianus Pediocactus sileri (Engelm.) L.D.Benson Pediocactus simpsonii (Engelm.) Britton & Rose Fritz Hochstätter, (2007)
Section Pediocactus Hochstätter Pediocactus knowltonii L.D.Benson Pediocactus nigrispinus (Hochstätter) Hochstätter Pediocactus nigrispinus subsp. nigrispinus Pediocactus nigrispinus subsp. beastonii (Hochstätter) Hochstätter Pediocactus nigrispinus subsp. indranus (Hochstätter) Hochstätter Pediocactus paradinei B.W.Benson Pediocactus simpsonii (Engelm.) Britton & Rose Pediocactus simpsonii subsp. simpsonii Pediocactus simpsonii subsp. bensonii Hochstätter Pediocactus simpsonii subsp. idahoensis Hochstätter Pediocactus simpsonii subsp. robustior (J.M.Coult.) Hochstätter Section Rhytidospermae Hochstätter Pediocactus bradyi L.D.Benson Pediocactus bradyi subsp. bradyi Pediocactus bradyi subsp. despainii (S.L.Welsh & Goodrich) Hochstätter Pediocactus bradyi subsp. winkleri (K.D.Heil) Hochstätter Pediocactus sileri (Engelm.) L.D.Benson 
