adder's tongue

/AE1 D ER0 EH0 S T AH0 NG/
noun
  1. 1

    Any of several ferns in the genus Ophioglossum, whose spores are produced on a spike resembling a serpent's tongue.

  2. 2

    A lily in the genus Erythronium, other common names of which include fawn lily, trout lily and dog's tooth violet.

  3. 3

    Hart's tongue (fern) (Asplenium scolopendrium, syn. Phyllitis scolopendrium).

Source: https://en.wiktionary.org/wiki/adder's%20tongue