Factsheet N18: Beech (Fagus) as a nut crop
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The tanbark oaks are evergreen trees that botanically form a link between the chestnuts (Castanea) and the oaks (Quercus); they have flowers similar to chestnut and bear acorns like oaks. There are some 300 species of Lithocarpus in the world but most are tropical trees and only a handful are hardy. The common names comes from the high levels of tannins in the bark, for which many species have long been utilised.