Botanical Identification of Hazelnut (Corylus avellana)

To identify Hazelnut (Corylus avellana) accurately, examine its morphological characteristics, taxonomic classification, and diagnostic features.

Hazelnut (Corylus avellana) Monograph

Scientific Classification

Hazelnut, or Corylus avellana, belongs to the kingdom Plantae, division Magnoliophyta, class Eudicots, order Fagales, family Betulaceae, genus Corylus, and species Corylus avellana. These classifications place it within the broader group of flowering plants and help identify its evolutionary relationships and botanical characteristics.

The following table shows the full taxonomy of this medicinal plant.

Botanical Nomenclature and Synonyms

The scientific name of Hazelnut is Corylus avellana, first described by Linnaeus in 1753. It is also known by several synonyms, including Corylus maxima and Corylus heterophylla, which refer to closely related species. Common names such as hazel nut, filbert, and cobnut are widely used, while regional and historical names vary across cultures and time periods.

Morphological Characteristics

Hazelnut (Corylus avellana) is a deciduous shrub or small tree with a bushy growth habit. It has a deep, fibrous root system that anchors it firmly in soil. The stem is upright, often branching from the base, and covered with rough, bark-like texture. Leaves are alternate, oval to heart-shaped, with serrated edges and a rough texture. The inflorescence consists of catkins, with male and female flowers on separate plants. The fruit is a spiny husk enclosing one or two oval seeds, known as hazelnuts.

Diagnostic Identification Features

Hazelnut (Corylus avellana) can be distinguished by its rounded, toothed leaves with a hairy underside, its unique hazelnut fruit that splits open to release seeds, and its alternate leaf arrangement. It differs from similar species like Corylus colurna by having shorter, more rounded nuts and a different leaf shape. The presence of male and female flowers on the same plant also aids in identification.

Natural Habitat and Geographic Distribution

Hazelnut (Corylus avellana) is native to Europe, western Asia, and northern Africa. It thrives in temperate climates with moderate rainfall. It prefers well-drained, loamy soils. It is typically found at altitudes between 200 and 1,500 meters.

Phenology and Growth Cycle

Hazelnut (Corylus avellana) blooms in early spring, typically between March and May, depending on the region. Seed formation occurs in late summer to early autumn, around August to September. Harvest timing for identification purposes is usually in late September to October when the nuts are fully mature and the husks begin to split.

Phylogenetic Relationships

Hazelnut (Corylus avellana) is closely related to other Corylus species within the Corylaceae family. It shares key characteristics with its genus relatives, such as persistent bracts and坚果-like fruits. Its family traits include shrub growth habits and wind-pollination, distinguishing it from other plant families.