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Celastraceae A family of trees and shrubs in which the leaves are simple, and opposite or alternate. The flowers are small, regular, and tri- or pentamerous, usually with a disc, and the ovary is superior. The fruits take various forms. The seed commonly has a vivid aril. Euonymus europaeus is the spindle tree or burning bush of Britain. There are 94 genera, with about 1300 species, with a cosmopolitan distribution, except for the Arctic and Antarctic.