Noun | 1. | family Oleandraceae - one of a number of families into which Polypodiaceae has been subdivided in some classification systems fern family - families of ferns and fern allies genus Oleandra, Oleandra - or family Polypodiaceae: tropical epiphytic or terrestrial ferns Arthropteris, genus Arthropteris - tropical and subtropical Old World epiphytic or lithophytic ferns genus Nephrolepis, Nephrolepis - small genus of tropical ferns; sometimes placed in Polypodiaceae |