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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 | Poales
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| | Family | Poaceae
– grasses, graminées |
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| | Genus | Arrhenatherum P. Beauv.
– oatgrass |
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| | Species | Arrhenatherum elatius (L.) P. Beauv. ex J. Presl & C. Presl – tall oatgrass |
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Direct Children: |
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| | Form | Arrhenatherum elatius f. striatum F.T. Hubb.
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| | Variety | Arrhenatherum elatius var. bulbosum (Willd.) Spenn.
– tall oatgrass, tuber oatgrass | |
| | Variety | Arrhenatherum elatius var. elatius (L.) P. Beauv. ex J. Presl & C. Presl
– tall oatgrass | |
| | Subspecies | Arrhenatherum elatius ssp. bulbosum (Willd.) Schübl. & G. Martens
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| | Subspecies | Arrhenatherum elatius ssp. elatius (L.) P. Beauv. ex J. Presl & C. Presl
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