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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 | Mammillaria Haw.
– pincushion cactus, globe cactus, fishhook cactus |
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| Species | Mammillaria petrophila K. Brandegee |
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Direct Children: |
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| Subspecies | Mammillaria petrophila ssp. arida (Rose) D.R. Hunt
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| Subspecies | Mammillaria petrophila ssp. baxteriana (H.E. Gates) D.R. Hunt
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| Subspecies | Mammillaria petrophila ssp. petrophila K. Brandegee
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