Also known as the morphological characteristics of hickory or walnut, the adult hickory tree is about 30 meters high, with smooth bark, green-brown when young and white when old. Bare buds, new shoots, back of leaves and outer surface of exocarp are densely covered with rusty yellow gland scales, odd pinnate compound leaves, and 5-7 leaflets. The nuts of Carya cathayensis are oval, with large top, thick shell, fat kernel and often split. The vast majority of Carya cathayensis belong to round fruit species, with oval and sharp fruit tips, asymmetric left and right halves, thick shell, two large partitions and six small partitions on the inner wall, which are easy to peel off and the nuts are often complete. The nut of another kind of flat fruit is oblate, with a slightly protruding top, a round base and a thick shell. The interior wall is divided into three big partitions and then into nine small partitions. Because there are many grooves in the shell, it is difficult to peel the shell, and most of the peeled kernels are incomplete. Pecan food with commercial value is mainly produced in Hangzhou and sold as a specialty of Hangzhou. In addition, the shell of Carya cathayensis can be used to make activated carbon, the shell, bark, branches and leaves can be used to produce natural plant fuel, tannin can be extracted from total buds, and wood can be used to make furniture and military purposes. The nutritional value is 1. Walnut kernel contains more protein and unsaturated fatty acids necessary for human nutrition. These components are important substances in brain tissue cell metabolism, which can nourish brain cells and enhance brain function. 2. Walnut kernel can prevent arteriosclerosis and lower cholesterol; In addition, walnuts can also be used to treat non-insulin-dependent diabetes; Walnuts can also relieve pain, increase white blood cells and protect the liver of cancer patients. 3. Walnut kernel contains a lot of vitamin E, which can moisturize and blacken hair if eaten regularly, making skin moist, smooth and elastic; Chewing some walnuts when you feel tired can relieve fatigue and stress. Carya cathayensis sarg is crisp and sweet, with a strong aroma. It can be used for pressing oil and frying food, and can also be used as a seasoning for making candy and cakes. Carya cathayensis kernel contains 7.8-9.6% protein, more than 7 kinds of amino acids necessary for human body, and the content is as high as 25%. It also contains 22 kinds of trace elements needed by human body, among which calcium, magnesium, phosphorus, zinc and iron are very rich. According to data analysis, each kilogram of walnut kernel is equal to the nutritional value of 9 kilograms of fresh milk or 5 kilograms of eggs and 2 kilograms of beef, which is more easily absorbed by the human body than milk, eggs and beef. Nucleolus also has the effects of moistening lung and benefiting qi, nourishing blood and relieving asthma, moistening dryness and resolving phlegm, and eliminating deficiency and cold. In addition to seed kernel, epicarp and root bark of Carya cathayensis can also be used as medicine. Fresh root bark can be soaked in water to treat foot hemorrhoids (toes are wet and itchy), and fresh exocarp can be used to treat beriberi. The benefits of eating pecans According to Compendium of Materia Medica, pecans are sweet in taste and flat in nature, which can replenish qi and blood, regulate dryness and eliminate phlegm, warm kidney and lung, and relieve asthma. Eating pecans regularly can nourish blood vessels, increase appetite, blacken hair and beard, and can also treat sexual dysfunction, neurasthenia, memory loss and other diseases, so there is a folk proverb that "people often eat walnut oil and white-haired old people play with yaks". Carya cathayensis has a nourishing and health-preserving effect on people of all ages, and it is beneficial for fetal bone development for pregnant women to eat more; Regular consumption by children is beneficial to growth and development, enhancing memory and protecting eyesight; Young people often eat it to make their bodies healthy and their skin smooth; Middle-aged and elderly people often eat it, which can protect the heart and moisten the lungs, improve intelligence and prolong life. Studies have confirmed that Carya cathayensis contains linoleic acid, linolenic acid and various trace elements. If people can eat walnut food regularly, they can lower their blood cholesterol. At the same time, walnuts are also rich in minerals such as calcium, phosphorus, iron, potassium, magnesium, zinc, manganese and various vitamins. Regular consumption not only has the function of strengthening the brain, but also prevents hypertension and cardiovascular and cerebrovascular diseases. At the same time, vitamin E rich in walnuts can improve the physiological activity of human skin and contribute to beauty. Edible efficacy 1, breaking blood and removing blood stasis. Can be used for treating amenorrhea due to blood stasis, abdominal pain due to blood stasis, hematocele, traumatic injury, and blood stasis. 2, moist and smooth intestines. It is difficult to solve constipation caused by intestinal dryness. This product can relieve bitterness, disperse blood stasis, enter the liver meridian and divide blood, and has strong effects of promoting blood circulation, regulating menstruation, removing blood stasis and promoting tissue regeneration, and is suitable for patients with severe blood stasis. In addition, it also has the function of moistening intestines and relieving cough. Precautions Walnuts should not be eaten with pheasants, and patients with pneumonia and bronchiectasis are not easy to eat. Walnut should not be eaten with wine. According to Song and Ma Zhi's "Kaibao Materia Medica", "Eating walnuts makes people hemoptysis". It may be because walnuts are hot, eating too much produces phlegm fire, and white wine is also sweet and spicy, so eating together is easy to cause blood heat. Especially people with chronic hemoptysis should avoid eating. For example, patients with bronchiectasis and tuberculosis will have hemoptysis if they drink white wine, but they will also get sick if they don't eat it with walnuts. Garden value as a street tree. This species has straight trunk end, nearly wide oval crown, developed root system, water resistance and moisture resistance, and can be planted alone or in clumps on lakes and lawns, and is suitable for shading trees and street trees, as well as afforestation along rivers and plains. It is a good tree species for urban and rural greening and fruit use, and can build economic forests on both sides of the Yangtze River in Jiangsu Province. Nuts are edible, and oil tastes delicious; Tough materials, excellent military materials. The oil content of seed kernel is above 70%.

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