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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 | Nyctaginaceae
– four o'clocks, nyctaginacées |
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| Genus | Anulocaulis Standl.
– ringstem |
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| Species | Anulocaulis leiosolenus (Torr.) Standl.
– ringstem, southwestern ringstem |
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| Variety | Anulocaulis leiosolenus var. gypsogenus (Waterf.) Spellenb. & Wootten – gypsum ringstem |
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