Calloideae is a monotypic subfamily of flowering plants in the family Araceae. 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.