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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 | Melocactus (L.) Link & Otto
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| Species | Melocactus curvispinus Pfeiff. |
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Direct Children: |
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| Subspecies | Melocactus curvispinus ssp. caesius (H.L. Wendl.) N.P. Taylor
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| Subspecies | Melocactus curvispinus ssp. curvispinus Pfeiff.
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| Subspecies | Melocactus curvispinus ssp. dawsonii (Bravo) N.P. Taylor
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| Subspecies | Melocactus curvispinus ssp. koolwijkianus (Suringar) G. Thomson
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