Ceratophyllum, modern descendent of first flower Ceratophyllum consists of six species found around the world today in the single genus in its own order, Ceratophyllales.
Scientific American(Aug 18, 2015)
n constituting the family Ceratophyllaceae: hornworts
Syn|Hyper
genus Ceratophyllum
magnoliid dicot genus
genus of dicotyledonous flowering plants regarded as among the most primitive of extant angiosperms