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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 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. [ 4 ] The pollen of hazel species, which are often the cause for allergies in late winter or early spring, can be identified under magnification (600×) by their ...
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.
Catkins of the hazel (Corylus avellana)Betulaceae, the birch family, includes six genera of deciduous nut-bearing trees and shrubs, including the birches, alders, hazels, hornbeams, hazel-hornbeam, and hop-hornbeams, numbering a total of 167 species. [2]
Erica: heath trees and shrubs; Erica arborea: tree heath Ericaceae (heath family) Kalmia: kalmia shrubs; Kalmia latifolia: mountain laurel Ericaceae (heath family) Lyonia: lyonia trees; Lyonia ferruginea: tree lyonia Ericaceae (heath family) Oxydendrum: oxydendrum trees; Oxydendrum arboreum: sourwood Ericaceae (heath family) 711
The tree produces spiky green fruits about the size of a golf ball, which turn brown and drop off the tree over an extended period beginning in fall and continuing over the winter.
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]