Adder's tongue is a common name for several plants and may refer to:
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Ophioglossum, a genus of ferns in the family Ophioglossaceae
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Erythronium (also known as fawn lily, trout lily, or dog's-tooth violet), a genus of lilies
California fetid adderstongue and Bigelow's adderstongue are common names for Scoliopus bigelovii
