Hazel Tree Types, Pictures and Species of Corylus

Picture of a Hazelnut Tree
Hazel Tree (Corylus colurna)
Hazel Tree (Corylus colurna)
Turkish Hazel Leaf (Corylus colurna)
Turkish Hazel Leaf (Corylus colurna)

Hazel trees (Corylus) are a genus of 26 species, mainly deciduous trees and some large shrubs, that are all native to the temperate regions of the northern hemisphere. These trees are also commonly known by their seed, a edible nut called a "Hazelnut", or a "cobnut". The trees may be commonly referred to as "Hazelnut Trees". See List of Hazel Vernacular Names for common names of the Corylus species in other languages.

Hazel nuts, (Hazelnuts)

The nuts of all species of Hazel (Corylus) are edible, however the species (Corylus avellana) is grown the most due to its higher production rate, and has many Cultivars. Hazelnuts can also be known as "Cobnuts" or "filbert nuts" .

Hazelnuts are used in confectionery to make some pralines, in chocolate for some chocolate bars (such as Cadbury's), and in some hazelnut paste products (such as Nutella). In the United States, hazelnut butter is being promoted as a more nutritious spread than its peanut butter counterpart, as Hazelnuts contain significant amounts of thiamine and vitamin B6, as well as smaller amounts of other B vitamins. Hazelnuts are rich in protein and unsaturated fat.

Identification of Hazel Trees;

The shape and structure of the involucre, nut and also the growth habit (whether a tree or a shrub), are important, as well as the leaves in the identification of the different species of Corylus (Hazel). See List of Hazel Tree Species.

Hazel tree species have simple, rounded leaves with a double serrated margin. Hazel flowers are produced very early in spring before the leaves, and are monoecious, with single-sex catkins, the male catkins are pale yellow and 5 ↔ 12 cm long, and the female ones are very small and largely concealed in the buds, with only the bright-red, 1 ↔ 3mm long styles being visible. Hazel seeds are nuts 1 ↔ 2.5cm long and 1 ↔ 2cm in diameter, surrounded by an involucre (husk) which partly to fully encloses the nut, (Hazelnut).

Facts about the Corylus Genus of Trees
  • Genus Latin Scientific Name = Corylus
  • Genus Name Pronunciation: KOR-ih-lus
  • Genus Name Meaning: From the Greek "krylos", meaning Hazelnut.
  • Genus Common Names = Hazel, Hazelnut, see List of Hazel Vernacular Names.
  • Number of Taxa in the Corylus Genus = 26, See List of Hazel Cultivars.
List of Hazelnut Trees, Corylus Genus, All known species, taxa types, organized by scientific Latin botanical name first and common names second
List of Hazelnut Tree Names
Botanical Tree NameCommon Tree Name
Corylus americana American Hazel, Hazelnut, American filbert
Corylus avellana Common Hazel
Corylus avellana var. avellana Distribution: Europe to Caucasus
Corylus avellana var. pontica Distribution: N. Turkey, W. Transcaucasus
Corylus chinensis Chinese Hazel
Corylus colchica Colchican Filbert
Corylus colurna Turkish Hazel
Corylus × colurnoides Trazel
Distribution: Transcaucasus
Corylus cornuta Beaked Hazel
Corylus cornuta ssp. californica California Hazel,
Distribution: British Columbia to California
Corylus cornuta ssp. cornutaDistribution: Canada, N. and E. U.S.A.
Corylus fargesii Farges' Hazel
Corylus ferox Himalayan Hazel
Corylus ferox var. ferox Himalayan Hazel, Distribution: C. Himalaya to Myanmar and Tibet
Corylus ferox var. thibetica Tibetan Hazel
Distribution: C. China
Corylus heterophylla Asian Hazel, Siberian Hazel
Corylus heterophylla var. heterophylla Distribution: SE. Siberia, S. Russian Far East, E. Mongolia, N. and NE. China, Korea, N. & C. Japan
Corylus heterophylla var. sutchuensis Distribution: China (Yunnan, Sichuan, Guizhou, Hubei, Hunan)
Corylus jacquemontii Jacquemont's Hazel
Corylus maxima Filbert, Giant Filbert, European Filbert
Corylus potaninii Distribution: SC. China, (Szechuan; Hupeh; Kweichau; Yunnan.)
Corylus sieboldiana Asian Beaked Hazel
Corylus sieboldiana var. mandshurica Manchurian Hazelnut
Distribution: SE. Siberia to N. & C. Japan
Corylus sieboldiana var. sieboldiana Distribution: S. Korea, Japan
Corylus wangii Wang's Hazel
Corylus wulingensis Distribution: China (Hunan)
Corylus yunnanensis Yunnan Hazel

List of Tree Names last up-dated on

List of Hazel Cultivars

  • 'Barcelona'
  • 'Butler'
  • 'Casina'
  • 'Clark'
  • 'Contorta' - (Corylus avellana) Corkscrew Hazel, Contorted Filbert, Harry Lauder's Walking Stick
  • 'Cosford'
  • 'Daviana'
  • 'Delle Langhe'
  • 'DuChilly'
  • 'England'
  • 'Ennis'
  • 'Fillbert'
  • 'Halls Giant'
  • 'Jemtegaard'
  • 'Kent Cob'
  • 'Lewis'
  • 'Tokolyi'
  • 'Tonda Gentile'
  • 'Tonda di Giffoni'
  • 'Tonda Romana'
  • 'Wanliss Pride'
  • 'Willamette'

Hazel (Corylus Genus) Vernacular names

English: Hazel
català: Avellaner
Cymraeg: Cneuen gyll
dansk: Hassel
Deutsch: Hasel
eesti: Sarapuu
magyar: Mogyoró
македонски: Леска
Nederlands: Hazelaar
日本語: ハシバミ属
norsk (bokmål)‎: Hassel
norsk (nynorsk)‎: Hassel
polski: Leszczyna
suomi: Pähkinäpensaat
svenska: Hassel
Türkçe: Fındık
українська: Ліщина