Ceratophrys (sera to fris)

[NL. (Boie), der of plants, containing a single genus with only one species, Cera tophyllum de mersum (hornwort). It is a slender aquatic herb, with whorled, finely di ected, rigid leaves, and small, solitary, monœcio us flowers, without calyx or corolla. It is common in pools or slow streams over a great part of the world. Hornwort (Ceratophyllum demersum).