Photo of coontail aquatic plant with penny for scale

    Coontail (Hornwort)

    Ceratophyllum demersum
    Photo of a clump of hydrilla held in a hand

    Hydrilla

    Hydrilla verticillata
    invasive icon

    Invasive

    Photo of tall thistle plants with flowers

    Tall Thistle

    Cirsium altissimum
    fork and knife icon

    Edible