The acorn grows longer, while the hazelnut is rounder; the acorn brain is fastened with a half-cap, resembling the protuberance on the brain of Sakyamuni. As for the acorn, it can grow to a great height, and in the Danish countryside, it is found everywhere; while the hazelnut will be less, and also shorter, not so easy to be found. Acorns are inedible and can cause severe constipation if eaten by mistake; hazelnuts, however, are one of the more nutritious of the nuts.

Hazelnut is one of the world's four major dry fruits (walnuts, lentils, hazelnuts, cashews), for the birch family Hazel genus shrubs or small trees. Acorn is the fruit of the oak tree, shaped like a cocoon, so it is also known as chestnut cocoon, rich in calcium, phosphorus, potassium and niacin and other minerals and vitamins, can be eaten.

Hazelnut for the plant kingdom, angiosperm phylum, dicotyledonous plants, primitive perianth subclass, beech order, birch family, hazel, hazelnut shrubs or small trees.

The acorn is a deciduous or evergreen tree of the kingdom Plantae, the phylum Angiosperms, the class Dicotyledons, the order Crustacea, the family Crustacea, the genus Quercus.

Hazelnut bark gray, branches dark gray, hairless. Leaves are oblong or broadly obovate, apically concave or truncate, with a triangular central cusp and irregularly biserrate margins, petioles sparsely covered with short hairs or nearly glabrous. Male inflorescence solitary, bract campanulate, densely pubescent and sparsely villous, distally lobed, lobes triangular, margin entire. Peduncle densely pubescent. Nut subglobose, glabrous or only apically sparsely villous.

Oak trees to 25 m, bark dark gray-brown, slightly smooth, branchlets brown, glabrous. Leaf margins are serrate, rarely entire, and the leaf blades glow reddish-brown in the fall before they fall. Male flower catkin pendulous, female flower solitary in involucre. The nut is solitary, the inner wall of the pericarp is glabrous, and the rudimentary ovule is situated outside the base of the seed.

Hazelnut is born at an altitude of 200 to 1000 meters in the shady slopes of the mountains in the thickets, China is mainly produced in Heilongjiang, Jilin, Liaoning, Hebei, Shanxi, Shaanxi, Turkey, Italy, Spain, the United States, North Korea, Japan, Russia, the East Siberia and the Far East, Mongolia, East also has a distribution.

The distribution of oak and terrain also has a certain relationship, in Asia, Europe, Africa, the Americas are distributed, rich in resources, about 300 species. China has more than 60 species of oak to Heilongjiang, Liaoning, Jilin, Inner Mongolia, Shandong, Henan, Guizhou, Guangxi, Anhui, Shaanxi, Sichuan and other provinces and regions for more.