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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 | Grusonia Rchb. f. ex Britton & Rose |
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Direct Children: |
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| Species | Grusonia aggeria (Ralston & Hilsenb.) E.F. Anderson
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| Species | Grusonia bradtiana (J.M. Coult.) Britton & Rose
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| Species | Grusonia clavata (Engelm.) H. Rob.
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| Species | Grusonia densispina (Ralston & Hilsenb.) Rebman
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| Species | Grusonia emoryi (Engelm.) Pinkava
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| Species | Grusonia grahamii (Engelm.) H. Rob.
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| Species | Grusonia kunzei (Rose) Pinkava
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| Species | Grusonia parishii (Orcutt) Pinkava
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| Species | Grusonia pulchella (Engelm.) H. Rob.
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| Species | Grusonia robertsii Rebman
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| Species | Grusonia schottii (Engelm.) H. Rob.
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