Pediocactella bradyi (L.D.Benson) Doweld species synonym

Pediocactus simpsonii var. minor (Engelm.) L.D.Benson variety synonym

Pediocactus simpsonii var. minor (Engelm.) Boissev. & Davidson variety synonym

Pediocactus simpsonii subsp. bensoniae (Engelm.) Hochstätter subspecies synonym

Pediocactus bradyi L.D.Benson species accepted

Pediocactus peeblesianus (Croizat) L.D.Benson species accepted

Pediocactus simpsonii (Engelm.) Britton & Rose species accepted

Pediocactus paradinei B.W.Benson species accepted

Pediocactus sileri (Daul) L.D.Benson species accepted

Echinocactus sileri Engelm. ex J.M.Coult. species synonym

Pediocactus knowltonii L.D.Benson species accepted

Navajoa fickeisenii Backeb. species synonym

Pilocanthus paradinei (B.W.Benson) B.W.Benson & Backeb. species synonym

Pediocactus simpsonii f. sandiamontanus Hochstätter form synonym

Pediocactus simpsonii subsp. robustior (J.M.Coult.) Hochstätter subspecies synonym

Pediocactus simpsonii f. prairie Hochstätter form synonym

Pediocactus simpsonii var. paradinei (B.W.Benson) Halda variety synonym

Pediocactus simpsonii var. nigrispinus Hochstätter variety synonym

Pediocactus simpsonii f. muehlii Hochstätter form synonym

Pediocactus simpsonii f. montanensis Hochstätter form synonym

Pediocactus simpsonii var. minor (Engelm.) Cockerell variety synonym

Pediocactus simpsonii f. kuenzleri Hochstätter form synonym

Pediocactus simpsonii var. knowltonii (L.D.Benson) Halda variety synonym

Pediocactus simpsonii subsp. indranus (Hochstätter) Hochstätter subspecies synonym

Pediocactus simpsonii var. indraianus Hochstätter variety synonym

Pediocactus simpsonii subsp. idahoensis Hochstätter subspecies synonym

Pediocactus simpsonii var. hermannii (W.T.Marshall) W.T.Marshall variety synonym

Pediocactus simpsonii f. flinspachii Hochstätter form synonym

Pediocactus simpsonii f. flaminggorgensis Hochstätter form synonym

Pediocactus simpsonii f. dinosauriensis Hochstätter form synonym

Pediocactus simpsonii f. campestris Hochstätter form synonym

Pediocactus simpsonii var. caespiticus Backeb. variety synonym

Pediocactus simpsonii subsp. bensonii Hochstätter subspecies synonym

Pediocactus simpsonii f. acklinii Hochstätter form synonym

Pediocactus robustior (J.M.Coult.) Arp species synonym

Pediocactus nigrispinus subsp. puebloensis Hochstätter subspecies synonym

Pediocactus nigrispinus subsp. indranus (Hochstätter) Hochstätter subspecies synonym

Pediocactus nigrispinus subsp. beastonii (Hochstätter) Hochstätter subspecies synonym

Pediocactus hermannii W.T.Marshall species synonym

Pediocactus bradyi var. knowltonii (L.D.Benson) Backeb. variety synonym

Toumeya fickeisenii (Backeb.) W.H.Earle species synonym

Echinocactus simpsonii var. robustior J.M.Coult. variety synonym

Echinocactus simpsonii var. minor Engelm. variety synonym

Pediocactus simpsonii subsp. simpsonii subspecies synonym

Pediocactus nigrispinus (Hochstätter) Hochstätter species accepted

Pediocactus nigrispinus subsp. nigrispinus subspecies synonym

Mammillaria spaethiana Späth species synonym

Mammillaria simpsonii (Engelm.) M.E.Jones species synonym

Mammillaria purpusii K.Schum. species synonym

Echinocactus sileri Daul species synonym

Utahia sileri (Daul) Britton & Rose species synonym

Pediocactus indranus (Hochstätter) Hochstätter species synonym

Echinocactus sileri Engelm. species homotypic synonym

Pediocactus simpsonii var. robustior (J.M.Coult.) W.T.Marshall variety synonym

Pediocactus simpsonii var. robustior (J.M.Coult.) L.D.Benson variety synonym

Pediocactus simpsonii var. indranus Hochstätter variety synonym

Pediocactus nigrispinus var. beastonii Hochstätter variety synonym

Echinocactus simpsonii Engelm. species synonym

Echinocactus simpsonii f. minor (Engelm.) Schelle form synonym

Pediocactus simpsonii var. simpsonii variety synonym

Toumeya knowltonii Anon. species synonym