Winter and spring seasons, the sky is high and the wind is clear, into the Dai village in Xishuangbanna , it is easy to see a local people especially favorite fruit tree - sour horn, it is a tall tree, the trunk is rough, the branches and leaves are sparse, the branches are hung with A string, a tuolu brown hook-shaped pods 5-12 centimeters long and 1.5 centimeters wide. Generally there are 2-6 fruits in a pod.

Sour horn, also known as sour beans, tamarind, Luo wangzi, sour plum (Hainan), "Mukhan" (Dai), sweet eye can, through the blood map, for the family Sapindaceae sour horn genus of tropical, subtropical evergreen tree, the genus contains only 1 species of sour horn, there are two types: sweet type and sour type. Acid horn like hot climate, in the average annual temperature of 18?C-24?C, annual rainfall of 500-1200 millimeters of the region can grow normally.

Edit paragraph geographic distribution

The Cape of sour horn is native to tropical Africa, and then introduced into India by the Sudan to reproduce and plant, the growth is very suitable, so that people mistakenly believe that the Cape of sour horn is a native plant of India. Later by the southern Asia spread to Persia, Arab countries and Europe and other places. In the 4th century B.C., it was once popular in ancient Egypt and Greece. In all the world's tropical fruit trees, Cape Sour is the most widely distributed, in addition to Antarctica, the other continents are distributed. Asia is the world's main production areas of Cape Sour. India, Sri Lanka and Southeast Asian countries are cultivated, mainly grown in the heat conditions, less rainfall, altitude of not more than 1500 meters of dry slopes. Among them, India, the Philippines, Thailand has a piece of orchard, and the yield is very considerable, only India's annual output of fruit pods amounted to 275,000 tons, the Philippines annually exported worth 80,000 U.S. dollars of capers, Thailand's famous sweet capers and sour capers every year, also a large number of exports to create foreign exchange. In the Americas, Cape Sour is mainly distributed in many countries in Latin America and the United States of America's hot and dry areas, Mexico cultivated area in the continent's largest, amounting to 4,443 hectares. The United States is mainly distributed in Hawaii, the southern section of the western Pacific coast, the Gulf Coast and Florida, there are the famous Meinele sweet capers. In Guatemala, the distribution is concentrated in the hot dry canyon of Metagua, and there is also a large area of wild Cape Sour trees. In Africa, Cape Sour is mainly distributed in Egypt, Ethiopia, South Africa, Lesotho, Kenya, Nigeria, Cameroon, Sudan and other countries in the low altitude barren slopes of drylands and deserts. South Africa and Ethiopia are relatively more abundant. In Europe, Cape Sour is mainly distributed in Portugal, Spain, France, Italy, Greece and other countries at an altitude of less than 1,000 meters offshore slopes, barren mountain slopes. Some families also like to plant Cape Sour to beautify the yard. In Oceania, Cape Sour is mainly distributed in Australia, Fiji and other countries. Sour horn in China is mainly distributed in Fujian, Guangdong, Guangxi, Sichuan, Yunnan and other provinces and districts in the south and Hainan, Taiwan, the altitude does not exceed 1400 meters of the dry slopes of the wasteland, hot and dry river valleys, courtyard four sides and coastal. The vast majority in the wild and semi-wild state, the area is estimated to be less than 830 hectares. For a long time, the conservation and development of sour hornbeam fruit trees have been neglected because of the large gap between the comparative interests of economic crops such as longan, lychee, mango, pineapple, coffee, rubber and coconut in the hot zone and those of sour hornbeam. Especially by the influence of the past extreme leftist ideology, a large number of old Cape Sour trees have been cut down, and the resource destruction is serious. Sour horn in Yunnan is mainly distributed in the Jinsha River, Nujiang River, Yuanjiang dry hot river valley and Xishuangbanna area, the altitude of 50-1350 meters in the heat of the good place, the natural growth of the Banna sweet type and ordinary sour type two types. Among them, Sichuan and Yunnan provinces within the Jinsha River Valley is the main producing areas of China's sour horn, annual output of sour horn 100 tons, yield, quality, flavor are better than other areas of the province. 1970s, sour horn in the mid-2020s, sour horn in the Guangzhou Trade Fair has attracted the attention of foreign merchants and inquiries, but unfortunately at that time, limited to the conditions were not able to open up in a timely manner to export. In recent years, with the development of the economy and people's further understanding and development of sour angle, sour angle has emerged in the domestic and international markets, shine.