Casearia: A plant genus of the family FLACOURTIACEAE. Members contain casearins which are clerodane type DITERPENES.Diterpenes, Clerodane: A group of DITERPENES cyclized into 2-rings with a side-chain.Salicaceae: A plant family of the order Salicales, subclass Dilleniidae, class Magnoliopsida. The leaves are alternate and simple. Staminate (male) flowers consist of from one to many stamens. Pistillate (female) flowers consist of a one-chambered ovary with several to many ovules (potential silky seeds).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.