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| Kingdom | Plantae
– plantes, Planta, Vegetal, plants |
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| Subkingdom | Viridiplantae
– green plants |
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| Infrakingdom | Streptophyta
– land plants |
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| Superdivision | Embryophyta
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| Division | Tracheophyta
– vascular plants, tracheophytes |
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| Subdivision | Spermatophytina
– spermatophytes, seed plants, phanérogames |
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| Class | Magnoliopsida
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| Superorder | Caryophyllanae
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| Order | Caryophyllales
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| Family | Cactaceae Juss.
– cactus, cacti |
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| Genus | Thelocactus (K. Schum.) Britton & Rose |
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Direct Children: |
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| Species | Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose
– glory of Texas, Biznaga-pezón bicolor | |
| Species | Thelocactus buekii (Klein bis) Britton & Rose
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| Species | Thelocactus conothelos (Regel & Klein bis) F.M. Knuth
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| Species | Thelocactus hastifer (Werderm. & Boed.) F.M. Knuth
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| Species | Thelocactus hexaedrophorus (Lem.) Britton & Rose
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| Species | Thelocactus lausseri Ríha & Busek
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| Species | Thelocactus leucacanthus (Zucc. ex Pfeiff.) Britton & Rose
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| Species | Thelocactus macdowellii (Rebut ex Quehl) W.T. Marshall
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| Species | Thelocactus multicephalus Halda & Panar.
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| Species | Thelocactus rinconensis (Poselger) Britton & Rose
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| Species | Thelocactus setispinus (Engelm.) E.F. Anderson
– miniature barrel cactus, Biznaga-pezón setosa, fishhook cactus | |
| Species | Thelocactus tulensis (Polseg.) Britton & Rose
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