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Source: The genus Thelocactus, website (version 2012)

ITIS records citing this source
 
 Kingdom Plantae
  Thelocactus (K. Schum.) Britton & Rose -- accepted
  Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose -- accepted -- Biznaga-pezón bicolor, glory of Texas
  Thelocactus bicolor ssp. bolaensis (Runge) Doweld -- accepted
  Thelocactus bicolor ssp. flavidispinus (Backeb.) N.P. Taylor -- accepted
  Thelocactus bicolor ssp. heterochromus (F.A.C. Weber) Mosco & Zanov. -- accepted
  Thelocactus bicolor ssp. schwarzii (Backeb.) N.P. Taylor -- accepted
  Thelocactus buekii (Klein bis) Britton & Rose -- accepted
  Thelocactus conothelos (Regel & Klein bis) F.M. Knuth -- accepted
  Thelocactus conothelos ssp. argenteus (Glass & R.A. Foster) Glass -- accepted
  Thelocactus conothelos ssp. aurantiacus (Glass & R.A. Foster) Glass -- accepted
  Thelocactus conothelos ssp. garciae (Glass & Mend.-Garc.) Mosco & Zanov. -- accepted
  Thelocactus garciae Glass & Mend.-Garc. -- not accepted
  Thelocactus hastifer (Werderm. & Boed.) F.M. Knuth -- accepted
  Thelocactus heterochromus (F.A.C. Weber) Oosten -- not accepted
  Thelocactus hexaedrophorus (Lem.) Britton & Rose -- accepted
  Thelocactus leucacanthus (Zucc. ex Pfeiff.) Britton & Rose -- accepted
  Thelocactus leucacanthus ssp. leucacanthus (Zucc. ex Pfeiff.) Britton & Rose -- accepted
  Thelocactus leucacanthus ssp. schmollii (Wederm.) Mosco & Zanov. -- accepted
  Thelocactus rinconensis (Poselger) Britton & Rose -- accepted
  Thelocactus rinconensis ssp. freudenbergeri (R. Haas) Mosco & Zanov. -- accepted
  Thelocactus rinconensis ssp. hintonii Lüthy -- accepted
  Thelocactus rinconensis ssp. nidulans (Quehl) Glass -- accepted
  Thelocactus rinconensis ssp. rinconensis (Poselger) Britton & Rose -- accepted
  Thelocactus tulensis ssp. buekii (Klein bis) N.P. Taylor -- not accepted
  Thelocactus tulensis ssp. tulensis (Polseg.) Britton & Rose -- not accepted
   

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