Are Ceratophyllum and Saguaro both plant genus? 
Ceratophyllum: Ceratophyllum is a cosmopolitan genus of flowering plants including four accepted species in 2016, commonly found in ponds, marshes, and quiet streams in tropical and in temperate regions. Saguaro: The saguaro ( , ] ) (Carnegiea gigantea) is an arborescent (tree-like) cactus species in the monotypic genus Carnegiea, which can grow to be over 40 ft tall.
no