Photo of an Engelmann’s adder’s tongue with a black background

    Adder's Tongues

    Ophioglossum spp.
    Photo of common scouring rush, many stems in a colony

    Horsetails (Scouring Rushes)

    Equisetum (3 spp. in Missouri)
    Photo of Mexican mosquito fern plants on a pond surface, surrounded by duckweed

    Mexican Mosquito Fern

    Azolla mexicana
    Photo of a sensitive fern, vegetative leaf

    Sensitive Fern

    Onoclea sensibilis