The Theaceae is a family of flowering plants, composed of shrubs and trees. The Theaceae is part of order Ericales, in the branch of the dicots known as the Asterids. Some botanists include the family Ternstroemiaceae within the TheaceaeRoyal Botanic Gardens, Kew. Vascular Plant Families and Genera: Theaceae while others do not.Watson, L., & Dallwitz, M. J. (1992 onwards). The families of flowering plants. Theaceae Theaceae can be described as having anywhere from 7-40 genera, depending on the… (More on Theaceae)