Sclerocactus johnsonii

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Sclerocactus johnsonii (Parry ex Engelm.) N.P.Taylor in Bradleya 5: 94. 1987 sec. Hunt 2016

≡Echinocactus johnsonii Parry ex Engelm., Botany (Fortieth Parallel): 117. 1871 syn. sec. Hunt 2006
≡Ferocactus johnsonii (Parry ex Engelm.) Britton & Rose, Cactaceae 3: 141. 1922 syn. sec. Kew WCVP (2019)
≡Echinomastus johnstonii (Parry ex Engelm.) E.M.Baxter, Calif. Cactus: 75. 1935 syn. sec. Parfitt & Gibson 2003
≡Thelocactus johnsonii (Parry ex Engelm.) W.T.Marshall in Cact. Succ. J. Gr. Brit. 9: 28. 1947 syn. sec. Hunt 2016
≡Neolloydia johnsonii (Parry ex Engelm.) L.D.Benson, Cacti Ariz., ed. 3: 25. 1969 syn. sec. Hunt 2016
≡Pediocactus johnsonii (Parry ex Engelm.) Halda in Acta Mus. Richnov., Sect. Nat., 5: 24. 1998 syn. sec. Kew WCVP (2019)

=Echinocactus johnsonii var. octocentrus J.M.Coult. in Contr. U.S. Natl. Herb. 3: 374. 1896 syn. sec. Kew WCVP (2019)
≡Echinocactus johnsonii subsp. octocentrus (J.M.Coult.) A.E.Murray in Kalmia 12: 20. 1982 syn. sec. Kew WCVP (2019)

=Echinocactus krausei Hildm. ex K.Schum., Gesamtbeschr. Kakt.: 446. 1897–1899 syn. sec. Kew WCVP (2019)
≡Echinocactus krausei Hildm. ex Mathsson. in Monatsschr. Kakteenk. 7: 107. 1897 syn. sec. Kew WCVP (2019)
≡Echinomastus krausei (Hildm. ex Mathsson) Berger ex Borg, Cacti, ed. 1: 237. 1937 syn. sec. Kew WCVP (2019)
≡Thelocactus krausei (Hildm. ex K.Schum.) H.P.Kelsey & Dayton, Standard. Pl. Names, ed. 2: 78. 1942 syn. sec. Kew WCVP (2019)

=Echinocactus johnsonii var. lutescens Parish in Bull. S. Calif. Acad. Sci. 25: 83. 1926 syn. sec. Kew WCVP (2019)
≡Echinomastus johnsonii var. lutescens (Parish) Wiggins, Veg. Fl. Sonoran Des. 2: 1011. 1964 syn. sec. Parfitt & Gibson 2003
≡Echinocactus johnsonii subsp. lutescens (Parish) A.E.Murray in Kalmia 12: 20. 1982 syn. sec. Kew WCVP (2019)

=Echinomastus arizonicus Hester in Cact. Succ. J. (Los Angeles) 5: 504. 1934 syn. sec. Kew WCVP (2019)

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