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13 adder's-tongues species
Ophioglossum pusillum
Ophioglossum gomezianum
Ophioglossum ellipticum
Ophioglossum vulgatum
Ophioglossum californicum
Ophioglossum engelmannii
Ophioglossum nudicaule
Ophioglossum petiolatum
Ophioglossum polyphyllum
Ophioglossum azoricum
Ophioglossum pycnostichum
Ophioglossum reticulatum
Ophioglossum crotalophoroides
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