Clusiaceae: The mangosteen plant family (sometimes classified as Guttiferae; also known as Hypericaceae) of the order THEALES, subclass Dilleniidae, class Magnoliopsida. It includes trees and shrubs with resinous, sticky sap, usually with broad-ended, oblong, leathery leaves with a strong, central vein, flowers with many stamens.Clusia: A plant genus of the family CLUSIACEAE. Members contain benzophenones.Calophyllum: A plant genus of the family CLUSIACEAE. Members contain costatolide, calanolides and 4-phenylfuranocoumarins (FUROCOUMARINS).Garcinia: A plant genus of the family CLUSIACEAE. Members contain XANTHONES.Plant Bark: The outer layer of the woody parts of plants.Plant Extracts: Concentrated pharmaceutical preparations of plants obtained by removing active constituents with a suitable solvent, which is evaporated away, and adjusting the residue to a prescribed standard.