This odd genus was implicated in the infamous Chase et al. (1993) paper.

Why is this paper infamous? This was one of the first major attempts at huge collaboration among botanists and is a huge sequencing effort that was very novel for the early 1990s, but is now common place.

Characteristics of Ceratophyllum include:

—small flowers
—absent perianth
—few number of flower parts

Taken from:
ISU Aquatic Botany Course