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Corylus avellana, the common hazel, is a species of flowering plant in the birch family Betulaceae. The shrubs usually grow 3–8 metres (10–26 feet) tall. The nut is round, in contrast to the longer filbert nut. Common hazel is native to Europe and Western Asia. The species is mainly cultivated for its nuts.
"The Hazel Branch" from Grimms' Fairy Tales claims that hazel branches offer the greatest protection from snakes and other things that creep on the earth. In the Grimm tale "Cinderella", a hazel branch is planted by the protagonist at her mother's grave and grows into a tree that is the site where the girl's wishes are granted by birds. [19]
Corylus americana, the American hazelnut [3] or American hazel, [4] is a species of deciduous shrub in the genus Corylus, native to the eastern and central United States and extreme southern parts of eastern and central Canada.
Turkish hazel makes a good shade tree since it produces very dense shade, and its narrow crown and ability to withstand air-pollution make it well suited for use as a street tree in urban areas. It makes a rather formal statement in the landscape due to the tight, consistently-shaped, narrow crown.
Corylus jacquemontii (Jacquemont's hazelnut or Indian tree hazel) is a species of hazel, found in Asia, within the Himalayas and from Afghanistan through to W. Nepal.It is a small tree or shrub, with grey bark, ovate or obovate (teardrop-shaped) leaves, small flowers and small edible nuts, grouped in small clusters.
It is a deciduous shrub or small tree growing to 7 m (23 ft) tall, with stems up to 20 cm (8 in) thick grey bark. The leaves are rounded, 4–13 cm ( 1 + 1 ⁄ 2 –5 in) long and 2.5–10 cm (1–4 in) broad, with a coarsely double-serrated to somewhat lobed margin and an often truncated apex.
The beaked hazel is the hardiest of all hazel species, surviving temperatures of −50 °C (−58 °F) at its northern limits. [ 5 ] It has a shallow and dense root system which is typically only 15 cm (6 in) deep, with a single taproot which may extend 0.6 m (2 ft) below the surface.
Its main use in the United States is as large filler (along with peanuts as small filler) in most containers of mixed nuts. Filberts are sometimes grown in orchards for the nuts, but much less often than the common hazel. [3] [4] The purple-leaved cultivar C. maxima 'Purpurea' is a popular ornamental shrub in gardens. [5]