|Leaves of Corylus avellana|
The Hazel is a member of the birch family of trees, Betulaceae, and can grow to a height of 30 feet. Typically it has a number of shoots or trunks branching out at ground level, which has led to some people referring to it as a bush as it doesn't meet the strict definition for a tree of having a single stem unbranched near the ground. This ability to produce multiple stems gives it a dense, spreading appearance and has led to it being used extensively for coppicing. Usually living for between 50 and 70 years, if it is coppiced it will live much longer, up to several hundred years.
- Corylus americana — American Hazel. North America.
- Corylus avellana — Common Hazel. Europe and western Asia.
- Corylus chinensis — Chinese Hazel. China.
- Corylus colchica — Colchican Filbert. Caucasus.
- Corylus colurna — Turkish Hazel. Southeastern Europe and Asia Minor.
- Corylus cornuta — Beaked Hazel. North America.
- Corylus fargesii — Farges' Hazel. China.
- Corylus ferox — Himalayan Hazel. Himalaya, Tibet and China.
- Corylus heterophylla — Asian Hazel. Asia.
- Corylus jacquemontii — Jacquemont's Hazel. Himalaya.
- Corylus maxima — Filbert. Southeastern Europe and southwest Asia.
- Corylus sieboldiana — Asian Beaked Hazel. Northeastern Asia and Japan
- Corylus wangii — Wang's Hazel. Southwest China.
- Corylus yunnanensis — Yunnan Hazel. China.