Annonaceae: The custard-apple plant family of the order Magnoliales, subclass Magnoliidae, class Magnoliopsida. Some members provide large pulpy fruits and commercial timber. Leaves and wood are often fragrant. Leaves are simple, with smooth margins, and alternately arranged in two rows along the stems.Annona: A plant genus of the family ANNONACEAE. It has edible fruit and seeds which contain acetogenins and benzoquinazoline and other alkaloids.Xylopia: A plant genus of the family ANNONACEAE. Members contain DITERPENES.Acetogenins: Polyketides of up to a few dozen carbons in length, formed by chain extension of multiple PROPIONATES and oxygenated to form tetrahydrofuran and lactone rings along the length of the chain. They are found in ANNONACEAE and other PLANTS. Related compounds cyclize to MACROLIDES.Polyalthia: A plant genus of the family ANNONACEAE. Members contain 8-oxopolyalthiaine.Aporphines: Dibenzoquinolines derived in plants from (S)-reticuline (BENZYLISOQUINOLINES).Rhamnaceae: The buckthorn plant family, of the order Rhamnales, includes some species with edible fruits and some that are medicinal.Rollinia: A plant genus of the family ANNONACEAE. Members contain aporphines, acetogenins and rollinone.Plant Bark: The outer layer of the woody parts of plants.