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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 | Amaranthaceae
– pigweed, amaranthes |
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| Genus | Grayia Hook. & Arn. – hopsage |
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Direct Children: |
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| Species | Grayia arizonica (Standl.) E.H. Zacharias
– siltbush, Arizona siltbush | |
| Species | Grayia brandegeei A. Gray
– siltbush, spineless hopsage, Brandegee's siltbush | |
| Species | Grayia plummeri (Stutz & S.C. Sand.) E.H. Zacharias
– Plummer's siltbush | |
| Species | Grayia spinosa (Hook.) Moq.
– spiny hopsage | |
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