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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 | Elymus L.
– wildrye |
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| Species | Elymus trachycaulus (Link) Gould ex Shinners – slender wheatgrass, slender wild rye |
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Direct Children: |
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| Subspecies | Elymus trachycaulus ssp. andinus (Scribn. & J.G. Sm.) Á. Löve & D. Löve
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| Subspecies | Elymus trachycaulus ssp. glaucus (Pease & A.H. Moore) Cody
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| Subspecies | Elymus trachycaulus ssp. novae-angliae (Scribn.) Tzvelev
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| Subspecies | Elymus trachycaulus ssp. subsecundus (Link) Á. Löve & D. Löve
– slender wheatgrass, bearded wheatgrass, slender wild rye | |
| Subspecies | Elymus trachycaulus ssp. teslinensis (A.E. Porsild & Senn) Á. Löve
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| Subspecies | Elymus trachycaulus ssp. trachycaulus (Link) Gould ex Shinners
– slender wheatgrass | |
| Subspecies | Elymus trachycaulus ssp. virescens (Lange) Á. Löve & D. Löve
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