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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 | Polypodiophytina
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| Class | Polypodiopsida
– leptosporangiate ferns |
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| Subclass | Ophioglossidae
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| Order | Ophioglossales
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| Family | Ophioglossaceae
– adder's-tongue |
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| Subfamily | Ophioglossoideae C. Presl
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| Genus | Ophioglossum L. – adder's-tongue, adderstongue |
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Direct Children: |
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| Species | Ophioglossum azoricum C. Presl
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| Species | Ophioglossum californicum Prantl
– California adder's-tongue, California adderstongue | |
| Species | Ophioglossum crotalophoroides Walter
– bulbous adder's-tongue, bulbous adderstongue | |
| Species | Ophioglossum engelmannii Prantl
– limestone adder's-tongue, limestone adderstongue, adderstongue | |
| Species | Ophioglossum lusitanicum L.
– least adder's-tongue | |
| Species | Ophioglossum nudicaule L. f.
– least adder's-tongue, least adderstongue | |
| Species | Ophioglossum petiolatum Hook.
– stalked adder's-tongue, longstem adder's-tongue, longstem adderstongue | |
| Species | Ophioglossum polyphyllum A. Braun
– large adder's-tongue, large adderstongue | |
| Species | Ophioglossum pusillum Raf.
– herbe-sans-couture, northern adderstongue, northern adder's-tongue | |
| Species | Ophioglossum reticulatum L.
– netted adder's-tongue, netted adderstongue | |
| Species | Ophioglossum vulgatum L.
– herbe sans couture, southern adderstongue, southern adder's-tongue | |
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