Species: ~ 14-18
- Corylus americana Marshall — (American hazel). Eastern North America.
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Corylus avellana L. — (Common hazel - Gemeine Hasel). Europe and western Asia.
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Corylus avellana L. cf. Controrta — (screwed hazel - Korkenzieher-Haselnuss, Schrauben-Hasel).
- Corylus chinensis Franch.— (Chinese hazel). Western China.
- Corylus colchica — (Colchican Filbert). Caucasus.
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Corylus colurna L. — (Turkish hazel - Baum-Hasel). Southeastern Europe and Asia Minor.
- Corylus cornuta — (beaked hazel). North America.
- Corylus ferox Wall. — (Himalayan hazel). Himalaya, Tibet and southwest China (syn. C. tibetica).
- Corylus fargesii — (Farges' hazel). Western China.
- Corylus heterophylla — (Asian hazel). Asia.
- Corylus jacquemontii Decne. — (Jacquemont's hazel). Himalaya.
- Corylus maxima — (Filbert). Southeastern Europe and southwest Asia.
- Corylus sieboldiana Blume. — (Asian Beaked Hazel). Northeastern Asia and Japan
syn.: Corylus mandshurica.
- Corylus wangii — (Wang's hazel). Southwest China.
- Corylus yunnanensis — (Yunnan hazel). Central and southern China.
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