Taxonomic Hierarchy
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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 | Lilianae
– monocots, monocotyledons, monocotylédones |
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| Order | Alismatales
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| Family | Ruppiaceae
– ditch grass, ditchgrass, ditch-grass |
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| Genus | Ruppia L.
– widgeonweed |
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| Species | Ruppia didyma Sw. ex Wikstr. |
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