Classification of the genus Corylus

G. Corylus Linnaeus 1753 [hazel]
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†Corylus acutertiaria Hickey 1977
Corylus americana Walter 1788
Corylus colurna Linnaeus 1753
Corylus ferox Wallich 1830
†Corylus fosteri Ward 1885
†Corylus harrimani Knowlton 1904
†Corylus insignis Heer 1871
†Corylus macquarrii Forbes 1851
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Invalid names: Corylus grandifolia Newberry 1868 [synonym]
†Corylus orbiculata Newberry 1868
†Corylus palachei Knowlton 1904
Corylus rostrata Aiton 1789