Citrus:
Citrus belongs to Rutaceae and Citrus. Sex likes warm and humid climate, and its cold tolerance is slightly stronger than pomelo, lime and sweet orange. The plants of Rutaceae and Citrinae are distributed between north latitude 16 ~ 37. It is a tropical and subtropical evergreen fruit tree (except Fructus Aurantii), and there are three genera of Fructus Aurantii, Citrus and Kumquat used for economic cultivation. Citrus grown in China and other countries in the world is mainly citrus.
morphological character
Citrus consists of roots, stems, leaves, flowers and fruits. Little tree. Simple compound leaves, wings usually narrow, or only traces, leaves lanceolate, oval or broadly ovate. Fruit-shaped species, usually oblate to nearly spherical, with thin and smooth skin, or thick and rough skin, yellowish, vermilion or crimson, sour or sweet flesh, or bitter taste, or other peculiar smell; Seeds are more or less numerous, sparse and seedless, usually oval, with narrow top and round bottom. The flowering period is April-May, and the fruiting period is10-65438+February. ?
Botanical history
China is one of the important origins of citrus, with rich citrus resources, many excellent varieties and a cultivation history of more than 4,000 years. After long-term cultivation and selection, citrus has become a precious fruit of human beings. According to textual research, citrus originated in Yunnan-Guizhou Plateau, went down the Yangtze River and spread to the south of Huaihe River. The lower reaches of the Yangtze River, until the Lingnan area. After long-term cultivation by the people of China. Choice, citrus has become a precious fruit of human beings.
In 65438+5th century, the Portuguese brought China sweet orange to the Mediterranean coast for cultivation, which was called "China Apple" locally. Later, sweet oranges spread to Latin America and the United States. 182 1 year, the British came to China to collect specimens and brought kumquat to Europe. 1892, the United States introduced ponkan from China, which was called "China tangerine". Oranges and oranges are collectively called "Mandarin" in English, which means "precious oranges in China".
Citrus was planted in Kagoshima and Long Island of Japan in the Tang Dynasty and selected by mutation. Citrus is cultivated in five continents, among which Brazil, the United States, China, Japan, Spain, Italy, Morocco, Mexico, Israel, South Africa, Algeria, Egypt, Greece, Turkey, Argentina, India and Australia have the largest planting area and output.
Refer to the above? Baidu encyclopedia-orange, Baidu encyclopedia-orange