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Corylus avellana 0001.JPG
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Fagales
Family: Betulaceae
Genus: Corylus

Hazel is a genus of trees and shrubs, in the birch family. There are 50 to 80 species, in four genera. They are native to the temperate regions of the northern hemisphere.