Calloideae
Introduction '''Calloideae''' is a monotypic subfamily of flowering plants in the family Araceae. The single genus in the subfamily 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, Calleae. Species in Calloideae are often found in marshy habitats in the northern hemisphere. Trichosclereids are not found in the flowers.
References * French, J.C. and Tomlinson, P.B. (1981). ''Vascular Patterns in Stems of Araceae: Subfamilies Calloideae and Lasioideae''. Botanical Gazette, Vol. 142, No. 3 (Sep., 1981), pp. 366–381. * Bogner, Josef and Nicolson, Dan H. (1991). ''A Revised Classification of Araceae with Dichotomous Keys''. Willdenowia, Bd. 21, H. 1/2 (Dec. 11, 1991), pp. 35–50. * Bown, Deni (2000). ''Aroids: Plants of the Arum Family ILLUSTRATED''. Timber Press.