![]() The shape and structure of the involucre, and also the growth habit (whether a tree or a suckering shrub), are important in the identification of the different species of hazel. The fruits are nuts 1–2.5 cm ( 1⁄ 2–1 in) long and 1–2 cm diameter, surrounded by an involucre (husk) which partly to fully encloses the nut. ![]() The male catkins are pale yellow and 5–12 centimetres (2– 4 + 3⁄ 4 inches) long, and the female ones are very small and largely concealed in the buds, with only the bright-red, 1-to-3 mm-long styles visible. The flowers are produced very early in spring before the leaves, and are monoecious, with single-sex catkins. Hazels have simple, rounded leaves with double-serrate margins. ![]() The genus is usually placed in the birch family Betulaceae, though some botanists split the hazels (with the hornbeams and allied genera) into a separate family Corylaceae. Hazels are plants of the genus Corylus of deciduous trees and large shrubs native to the temperate Northern Hemisphere. ![]()
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