The now extinct genus Parasaurauia is thought to have belonged to the Actinidiaceae and was located in North America during the early Campanian.
Elsewhere, other major hostplant families include Actinidiaceae, Araceae, Begoniaceae and Dilleniaceae.
The circumscription of the family is variable, with some systems describing the family as consisting solely of the genus Sladenia, which has been variously considered a member of the Theaceae, the Actinidiaceae, the Dilleniaceae, or the Ternstroemiaceae.