Corylus avellana L.

hazel, hazelnut
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Corylus avellana
Elena Torres & Santiago Moreno
Licensed under CC BY-NC-SA

Corylus avellana: Appearance of three specimens in spring and summer

Appearance of three specimens in spring and summerBranch with rough, broad leaves with highly marked veins and doubly serrate marginsBranch with male flowers in catkins up to 8 cm long Branch with female flowers in a scaly glomerule from which the reddish styles protrudeBranch with 2 immature nuts held in a leafy involucre that partially encloses them

Corylus: Ancient Latin name for hazel

avellana: apparently derived from Avella, an Italian town where the plant used to be very abundant


Habit: Deciduous, monoecious shrub or small tree up to 8 m tall with a bark that is almost smooth and an irregular, open crown.

Leaves: alternate, deciduous, 5-15 cm long, with caducous stipules, shortly petiolate, simple; blade suborbicular to broadly ovate, cordate at the base, with straight secondary veins and doubly serrate margins, acuminate, generally glabrate adaxially and with pubescent veins abaxially.

Flowers: proteranthous, unisexual; male flowers in pendulous cylindrical catkins up to 8 cm long, arranged in groups of 2-5 towards the ends of branchlets, each in the bract axil and with two bracteoles, naked, with 4-8 stamens with bifid filaments. Female flowers epigynous, in groups of 1-6, surrounded by an involucre of scaly bracts, each wih a very small calyx and a syncarpous, 2-carpellate gynoecium with a bilocular inferior ovary and a style divided from the base into two elongated reddish branches.

Fruit: nut (hazelnut or cobnut), produced in clusters of 1-4 in a common leafy involucre, with deep, irregular indentations at the apex; nut 1.5-2 cm long, broadly ovate to globose, acuminate, with a woody reddish-brown pericarp and a single seed.


It flowers in winter or at the beginning of spring, before the leaves emerge, and the hazelnuts mature at the end of the summer or the beginning of autumn.

Geographic origin

Native to Europe and W Asia. In the Iberian Peninsula it mainly occurs in the northern half.


It is often cultivated as an ornamental but is mainly grown (in Spain, especially in the regions of Catalonia and Levante) for its fruits, whose seeds (hazelnuts) are highly appreciated in confectionery and are an essential component of spreads such as "Nutella". Hazelnuts have high nutritional value, as they contain up to 50-60% of oil rich in unsaturated fatty acids and vitamin E. Hazel branches (formerly used to administer corporal punishment at schools) are used to make walking sticks; forked twigs of hazel are favored by deviners to find water.

Corylus maxima Mill., native to SE Europe, is also cultivated as a garden plant.

It is propaged from seeds, by separating root suckers, by layering or from hardwood cuttings.

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