What walnut variety is the best

There are actually many varieties of walnuts, but many people are not so clear about them, or even cannot distinguish the specific varieties of walnuts at all. So when eating walnuts, they don’t know the specific nutrients they are consuming. In fact, the most common ones are smooth walnuts and hemp walnuts. This type of walnut is judged based on the smoothness of the walnut itself. If this is the case, the nutritional value is also different.

The hometown of walnuts is Iran in western Asia. They were brought back to China by Zhang Qian during his diplomatic mission to the Western Regions during the Han Dynasty.

1. According to the origin, there are Chencang walnut, Yangping walnut and wild walnut;

2. According to the maturity period, there are summer walnuts and autumn walnuts;

3. According to the smoothness of the shell, there are smooth walnuts and hemp walnuts;

4. There are two categories according to the thickness of the shell, namely thin-shell walnuts and thick-shell walnuts.

Walnut species in my country

According to the book "Chinese Walnut", the existing walnut plants in my country (including those introduced from abroad and discovered natural hybrids) are divided into 3 groups and 8 species.

Walnut group: walnut, iron walnut

Walnut group: Walnut tree, wild walnut, hemp walnut, Jibao walnut, heart-shaped walnut.

Black walnut group: black walnut.

Walnut Group

(1) Walnut, also known as walnut and Qiang peach, is the most widely cultivated fruit both at home and abroad. It is a deciduous tree, generally 10 to 20 meters tall, but can reach a maximum of over 30 meters, with a trunk diameter of about 1 meter. It can live up to 100 to 200 years, and up to over 500 years. The crown of the tree is open and semicircular or round-headed, with a diameter of 6 to 9 meters. The bark is grayish white to dark brown. The bark of young trees is smooth, while the bark of old trees has irregular shallow longitudinal cracks. The branches are thick and smooth. The young branches are green when they are first born, and may be slightly red in early spring. After they stop growing, they turn into bright gray or gray-brown, with white lenticels. The pith of one-year-old branches is larger and the xylem is soft. Later, the pith becomes smaller as the age increases. The leaves are odd-pinnate compound leaves, alternate, 30 to 40 cm long, with rounded petioles, enlarged bases with glandular dots, and large, triangular leaf scars after falling off. There are 5-9 leaflets, which are oblong, obovate or broadly elliptic, with short petioles, slightly pointed tips, and entire or slightly serrated margins.

Mixed buds are mostly round, while nutrient buds are triangular and scaly, growing in the axils. The male and female plants are monoecious with different flowers and maturation. The male inflorescence is a drooping raceme, 8-12 cm long, with 6-lobed perianth. Each male inflorescence has thousands of florets, up to more than 100. Each floret has 12-26 stamens. The filaments are extremely short, and the anthers are apricot yellow when mature. There are 1-3 female flowers clustered at the top of the branches. The perianth has 4 lobes, the stigma has 2 lobes, occasionally 3-4 lobes, pinnate-recurved, light green or pink, and the ovary is densely covered with fine soft hairs on the outside. It has one room and is inferior. The fruit is a jujube, round or oblong, 4-5 cm in diameter, with a thin exocarp, smooth or hairy surface, green with yellow-white spots; the mesocarp is fleshy; the endocarp (called the husk) is bony with grooves or wrinkles on the surface. There is a seed in the husk, called the kernel, which is the edible part, which is brain-shaped and covered with a thin light yellow or yellowish brown seed coat with obvious or unclear veins.

1. Iron walnut is also called Yangbi walnut, and the cultivated type is mostly called soaked walnut, tea walnut, etc. The main difference between the iron walnut and the walnut is that the walnut has 9 to 13 leaflets, the leaves gradually become smaller from bottom to top, the leaflets are elliptical-lanceolate, and the top leaflets often degenerate into linear bodies 1 to 1.5 cm long, so the rows are like even-pinnate compound leaves, and the leaf margins are entire or slightly serrated. The fruit is oblate and the shell is obviously wrinkled. The shells can be thin or thick; the shells of cultivated types are easy to crack, while those of wild types are more difficult to crack. Other morphological characteristics are similar to walnuts.