How to sign: genus of mostly woody relatively primitive dicotyledonous flowering plants with flowers often unisexual and often borne in catkins
Categories: dicot genus, magnoliopsid genus
Within this category: Alnus, Betula, Carpinus, Castanea, Castanopsis, Chrysolepis, Corylus, Fagus, Lithocarpus, Nothofagus, Ostrya, Ostryopsis, Populus, Quercus, Salix