Angiosperms - flowering plants see Subclass Magnoliidae Novák ex Takht. (1967) Mesangiosperms see Clade Mesangiospermae Donoghue, Doyle & Cantino 2007 [Donoghue, Doyle & Cantino 2020] Order Ceratophyllales Link (1829) [monotypic] Family Ceratophyllaceae Gray (1822), nom. cons. - hornwort family