scientific name: Zizyphus jujuba English name: jujube or Chinese date(date is the English for date dates). Classification: Dicotyledonous Plants, Rhamnaceae. Also known as red dates, beautiful dates and good dates. Jujube is a mature fruit of deciduous shrub or small arbor plant jujube tree of Rhamnaceae. Jujube trees are widely cultivated in China, reaching Jinzhou and Beizhen in Liaoning Province in the north, with the largest output in Shandong, Hebei, Shanxi, Shaanxi, Gansu, Anhui and Zhejiang. The famous variety is Jinsixiaozao, with small fruit and high sugar content, which is produced in Laoling, Shandong, Cangxian, Hebei and Miyun, Beijing. In addition, there is jujube, also known as "hanging jujube", which is mainly produced in Binxian County, Shaanxi Province. The fruit is large, weighing 3 ~ 4 grams, oblong, thin skin, thick meat, small core, sweet taste and ripe in late September. Sihong jujube in Sihong, Jiangsu Province, has been proved by experts from Nanjing Agricultural University, Jiangsu Agriculture and Forestry Department and China Jujube Research Institute. Among more than 7 known jujube varieties in China, Sihong jujube has the largest fruit type. This variety is immune to jujube witches' broom, and its resistance to fruit shrinkage and anthracnose is better than other varieties. Jujube has been listed as one of the "five fruits" (peach, plum, plum, apricot and jujube) since ancient times, with a long history. The most prominent feature of jujube is its high vitamin content. A clinical study abroad shows that patients who eat jujube continuously recover more than three times faster than those who simply take vitamin drugs. Therefore, jujube has the reputation of "natural vitamin pills". Classification of jujube varieties (1) Generally, according to the region, it is divided into two ecotypes: Nanzhao and Beizao, with the annual average temperature of 15 degrees as the boundary. (2) According to the size and shape of the fruit ① According to the size of the fruit, it can be divided into jujube and jujube. Jujubes such as Lingbao Jujube, Grey Jujube, Zanhuang Jujube, Fuping Jujube and so on; Jujube such as golden jujube, seedless jujube, heart-shaped jujube and so on. ② The fruit size and shape were combined and divided into 6 categories. Jujube type, such as golden jujube, seedless jujube, heart-warming jujube, Miyun jujube, etc. Long jujube types, such as Langzao, Huping Jujube, Junzao, Zanhuang Jujube, Guanyang Changhong, etc. Round jujube type, such as Zanhuang round jujube, round bell jujube, slow de round jujube, etc.; Flat round type, such as winter jujube, flower jujube and so on; Ripped dates, such as goat's milk dates, gourd dates and mopan dates; Jujube with persistent calyx, such as persimmon top jujube and Wuhua jujube. (3) Classification by use This is the most commonly used classification method: ① Dried varieties. It is characterized by thick meat, less juice, high sugar content and high drying rate. Such as golden jujube, Zanhuang jujube, Pozao, Lingbao jujube, Langzao and Xiangzao. ② Fresh food species. It is characterized by thin skin, tender and crisp meat and sweet juice. Such as winter jujube, Linyi pear jujube, big white bell, honey pot and so on. ③ Dual-purpose varieties. It can be eaten fresh or dried or processed into candied dates and other products. Such as Mingshan jujube, Junzao, Huizao, Jinzao, Huping jujube, Banzao and so on. ④ Jujube varieties. It is characterized by large and tidy fruit, thick and loose meat, less juice, thin skin, low sugar content, large cell cavity and easy absorption of sugar juice. Such as Yiwu jujube, Xuancheng pointed (round) jujube, Guanyang long jujube and so on. 1. Jujube can improve human immunity and inhibit cancer cells: pharmacological studies have found that jujube can promote the production of white blood cells, reduce serum cholesterol, increase serum albumin and protect the liver. Jujube also contains substances that inhibit cancer cells and even transform cancer cells into normal cells; 2. People who often eat fresh dates rarely suffer from gallstones. This is because the rich vitamin C in fresh dates transforms excess cholesterol in the body into bile acids. With less cholesterol, the probability of stone formation decreases. 3. Jujube is rich in calcium and iron, which play an important role in the prevention and treatment of osteoporosis and anemia. Middle-aged and elderly people often suffer from osteoporosis during menopause, and teenagers and women who are at the peak of growth and development are prone to anemia. Jujube will have an ideal therapeutic effect on them, and its effect is usually incomparable with drugs; 4. It also has a good nourishing effect on people who are weak after illness; 5. Rutin contained in jujube is a substance that softens blood vessels, thus lowering blood pressure, and has preventive and therapeutic effects on hypertension; 6. Jujube can also resist allergy, remove foul smell, soothe the nerves, improve intelligence and brain, and stimulate appetite.