Species
Species recognized by International Cactaceae Systematics Group. (Anderson E. F., 2001)
Thelocactus bicolor (Galeotti ex Pfeiffer) Britton & Rose 1922
- Thelocactus bicolor subsp. flavidispinus (Backeberg) N. P.Taylor 1998
- Thelocactus bicolor subsp. schwarzii (Backeberg) N. P.Taylor 1998
- (synonymum Thelocactus bicolor var. bolaensis, var. schotti, var. texensis, var. tricolor)
Thelocactus conothelos (Regel & Klein) Backeberg and F. M. Knuth 1935
- Thelocactus conothelos subsp. argenteus (Glass & R. Foster) Glass 1998
- Thelocactus conothelos subsp. aurantiacus (Glass & R. Foster) Glass 1998,
- (synonymum Thelocactus conothelos subsp. flavus)
Thelocactus garciae Glass & M. Mendoza 1998
Thelocactus hastifer Werdermann & Boedeker) F. M. Knuth 1935
Thelocactus heterochrontus (F. A. C. Weber) Oosten 1940
Thelocactus hexaedrophorus (Lemaire) Britton & Rose 1922
- Thelocactus hexaedrophorus subsp. lloydii (Britton & Rose) N. P. Taylor 1998
- (synonymum Thelocactus fossulatus)
Thelocactus lausseri Riha & Busek 1986
Thelocactus leucacanthus (Zuccarini) Britton & Rose 1923
- Thelocactus leucacanthus subsp. schmollii (Werdermann) Mosco &Zanovello 1999
Thelocactus macdowellii (Rebut ex Quehl) Glass 1969
Thelocactus rinconensis (Poselger) Britton & Rose 1923
- Thelocactus rinconensis subsp. hintonii M. Luthy 1997
- (synonymum Thelocactus nidulans, T. lophothele, T. phymathothelos)
Thelocactus setispinus (Engelmann) E. F. Anderson 1987
- (synonymum Hamatocactus setispinus)
Thelocactus tulensis (Poselger) Britton & Rose 1923
- Thelocactus tulensis subsp. buekii (Klein) N. P.Taylor 1998
- Thelocactus tulensis subsp. matudae (Sanchez-Mejorada & A. B. Lau) N. P. Taylor 1998
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—Aldous Huxley (18941963)