adder's tongue

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

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

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

(Chester) early-purple orchid, early spring orchis Orchis mascula