A collection of pictures of walnut species

Walnut is a kind of nut food, and his hometown is Iran in western Asia. Zhang Qian brought it back to China after a mission to the Western region in the Han Dynasty, and according to the book "Chinese Walnut", the existing walnut plants in China are divided into three groups and eight species. Here, I would like to introduce a complete picture of walnut species.

According to the book Chinese Walnut, there are 3 groups and 8 species of walnut plants in China: walnut group (walnut, iron walnut), walnut catalpa group (Juglans mandshurica, wild walnut, hemp walnut, Jibao walnut, heart-shaped walnut), black walnut group (black walnut).

1. Walnut

Walnuts, also known as walnuts and Qiang peaches, are found in North, Northwest, Southwest, Central China, South China and East China, southern and western Xinjiang. They are generally as high as 3murine 5 meters, and some are as high as 20-25 meters. The life span is as long as one or two hundred years, up to more than 500 years. The fruit is round or oblong, the shell is covered with grooves or wrinkles, the kernel is edible, brain-shaped, light yellow or yellowish brown thin seed coat, with obvious or inobvious veins.

2. Iron walnut

Iron walnut is mainly distributed in Yunnan, the southeast of Xizang, southern Sichuan, Guizhou and other places; the fruit is round, yellowish green, the surface is covered with velvet hair, there is a seed inside, the surface of the fruit shell is engraved, and the fruit shell is divided into thick and thin. Its nuts are used to extract oil, its hard shell can be used to make a variety of beautiful and durable handicrafts, and a large iron walnut can be used as a fitness ball.

3. Juglans mandshurica

Juglans mandshurica is distributed in Heilongjiang, Jilin, Liaoning, Hebei and Shanxi. The fruit is globose, oval or oval, with 8 longitudinal edges on the surface of the core and irregular gaps in the inner pericarp wall. Its seed kernel and seed oil are edible; bark, leaf and exocarp contain tannin and extract tannin extract; bark fiber can be used as raw materials such as papermaking; wood is widely used in construction, ship, vehicle decoration, military industry, furniture, etc.; branches, leaves and bark can be used as pesticides.

4. Wild walnut

Wild walnut alias hickory, distributed in Gansu, Shaanxi, Shanxi, Henan, Hubei, Hunan, Sichuan, Guizhou, Yunnan, Guangxi, Xinjiang; fruit ovoid or oval, exocarp densely glandular hairy, drupe or broadly ovoid, endocarp hard. Its seed oil is edible and can be used as soap and lubricating oil; the endocarp is thick and can be made into activated carbon; the bark and exocarp contain tannins which can be used as raw materials for tannin extract; the bast fiber of bark can be used as raw materials for fiber industry; the wood is solid and uncracked for a long time and can be used as furniture.

5. Hemp walnut

Walnut is mainly distributed in some mountainous areas of Hebei, Tianjin, Shanxi and Beijing in China (Nankou and Xiakou). The fruit is nearly globular, the kernel is nearly globular, and the tip is pointed. Its fruit can be used for hand play and literary play, and its advantage is that it is not cold in winter and not irritable in summer. At the same time, it can be carved into handicrafts, such as agate, like jade, and hard wood, which can be used for military industry.

6. Jibao walnut

Jibao walnut, also known as Jibao walnut, butt walnut, ghost walnut, Japanese walnut, originated in Japan, was introduced into China in the 1930s and was planted in Liaoning, Jilin, Shandong and Shanxi. The fruit is spherical, the nut has 8 obvious ridges, the suture line is protruding, the shell is thick, the inner septum is bony, and it is difficult to remove kernels. Its fruit can be used as a handstring, neither abuse the hand nor brush it.

7. Heart-shaped walnut

Heart-shaped walnut, alias Ji walnut, originated in Japan, was introduced to China in the 1930s and is now planted in a small amount in Liaoning, Jilin, Shandong, Shanxi, Inner Mongolia and other provinces; the fruit is flat heart-shaped, smooth, the apex is pointed, the suture line is wide on both sides, and the other side is narrow, which is equivalent to a wide area of 1 inch 2, with a longitudinal concave groove in the middle. The nut shell is strong and thick, and there is no inner fold wall. The whole kernel can be taken from the suture, and the kernel yield is 30%-36%.

8. Black walnut

Black walnut distributed in the eastern half of the United States and the southern part of Canada, introduced in China in 1984; the fruit is round, light green, with small protuberances and hairs on the surface; nuts are round, slightly flat, apex acuminate, the shell has irregular deep grooves, and the shell is thick and difficult to crack. Its wood texture is beautiful, and it is a good material for furniture and plywood.

The above is the introduction of 3 groups and 8 species of walnut. I hope it will be useful to you.