Which cacti has more species, Cereus or Limnanthes?
Cereus (plant) Cereus is a genus of cacti (family Cactaceae) including around 33 species of large columnar cacti from South America. The name is derived from Greek (κηρός) and Latin words meaning "wax" or "torch". The genus "Cereus" was one of the first cactus genera to be described; the circumscription varies depending on the authority. The term "cereus" is also sometimes used for a ceroid cactus, any cactus with a very elongated body, including columnar growth cacti and epiphytic cacti.
Hylocereus Hylocereus is a genus of cacti, often referred to as night-blooming cactus (though the term is also used for many other cacti). Several species have large edible fruits, which are known as pitahayas or dragonfruits. Whether "Hylocereus" is a distinct genus is uncertain as of July 2013 .