Ophioglossum, the adder's-tongue ferns, is a genus of about 50 species of ferns in the family Ophioglossaceae. The genus name comes from Ancient Greek ὄφις, meaning "snake", and γλῶσσα, meaning "tongu

Ophioglossum vulgatum, commonly known as adder's-tongue, southern adder's-tongue or adder's-tongue fern, is a species of fern in the family Ophioglossaceae.