Cereus is a genus of sea anemones in the family Sagartiidae.
Ceylalictus cereus is a species of bees in the genus "Ceylalictus", of the family Halictidae.
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.
Calloideae is a monotypic subfamily of flowering plants in the Araceae family.
 The single genus in the family is Calla, although in the past under Engler's description of Araceae it included four genera, namely Lysichiton, Symplocarpus, Orontium, and Calla.
 The subfamily was subsequently made monotypic and given a single tribe, Callea.
 Species in Calloideae are often found in marshy habitats in the northern hemisphere.
 Trichosclereids are not found in the flowers.
Lysichiton is a genus in the family Araceae.
 These plants are known commonly as skunk cabbage or less often as swamp lantern.
 The spelling Lysichitum is also found.
 The genus has two species, one found in north-east Asia (Japan and Russian Far East), the other in north-west America (Aleutians to Santa Cruz County in California).

Question: While Cereus is a genus of the family Cactacea, what genus is the Lysichiton from?
Answer: family Araceae