All the year round, citrus fruits occupy half of the fruit stand, orange, grapefruit, orange, kumquat, mandarin, mandarin, mandarin, mandarin, mixed mandarin, lemon, lime... Green, yellow, orange, orange red, round, very pleasing, no one is likely to refuse citrus fruit?

    But did you know that this family is really a history of hybridization? Citrus fruits are almost always hybrids!

    Simply put, an orange and a grapefruit cross into an orange. In the years that followed, under the influence of the strong genes of the citrus family, the grapefruit and the orange crossed again into a lime, the orange and the orange crossed again into a citrus, the orange and the grapefruit crossed again into a grapefruit, and the orange and the lime crossed again into a lemon.

    Some netizens compare the relationship between oranges, tangerines, pomelos, oranges and lemons to the relationship between your aunt two, three, four, five and six.In fact, in the botanical classification they belong to the branch angiosperms -- dicotyledonous -- noninvasive -- rutaceae -- citrus, evergreen or deciduous trees, shrubs or climbing vines or herbs, usually containing volatile oil, leaves with clear oil glands, and fruit skins usually containing oil-storage cells or secretory cavities.

     However, after all is the first orange or the first grapefruit, in the citrus family who is the senior level of the core figure? The answer is -- pomelo. To understand the history of the citrus family, one has to go back to the grandmother of the pomelo family.

     No matter orange or pomelo, the origin is in China, rich in resources, a variety of excellent varieties, more than 4,000 years of cultivation history. According to textual research, it was not until 1471 AD that citrus, orange, orange and other citrus fruit trees were introduced from China to Lisbon, Portugal, and from 1665 AD to Florida, the United States.

     With the development of technology, after a large amount of DNA analysis, the United States published an extremely long paper in the journal nature, which finally sorted out the family tree of citrus family and sorted out the following relationship:

     First, grapefruit is grapefruit, citron is citron, orange is orange, but orange is not necessarily orange.

     The 2nd, all citrus on the world is the family that love each other each other, citron becomes dad only, grapefruit becomes mom only, orange becomes dad to also become mom already.

     Third, the whole family was probably "Himalayan people", who went east to treasure island and south to Australia after coming down the mountain 8 million years ago.

     Citrus fruits have a messy family history, with the three oldest members of the citrus family: citron, grapefruit, and wide-skinned oranges. So how did the three elders marry to form a loving family?

      It is said that oranges originated in the south of China. Later, people thought they were delicious and planted them together to produce a new variety.

      Grapefruit and wide-skinned orange naturally cross produce oranges, oranges from their parents inherited good genes, both like wide-skinned orange as sweet and sour taste, no grapefruit bitter taste, and better than grapefruit peel, thus becoming the world's most important citrus fruit.

      Citron and orange cross the star that produces citrus bound again - lemon, besides having pure and fresh aroma and distinctive acerbity taste, because it is rich in vitamin C, be used to prevent and cure scurvy in nautical period. The love child of a sweet orange and a wide-skinned orange is the legendary "tangerine".

     Citrus is the most important group of citrus trees, there are 17 species, divided into 6 groups: great wing orange, yichang orange, citron and lemon, pomelo, orange and wide peel orange. Citrus fruits include oranges, tangerines, grapefruits, citron, sweet oranges, limes, kumquats, lemons, etc.

     Orange, orange, citrus silly points do not know, exactly how to distinguish these brothers and sisters in the vast sea of orange?

     Tangerines and tangerines belong to the category of "wide-skinned tangerines" in citrus taxonomy. People often confuse tangerines (such as reed tangerines) with tangerines (such as granulated tangerines, nanfeng tangerines and wenzhou tangerines) and think they look very similar. This is because tangerines are the result of incest between oranges and tangerines.

    Orange peel is very easy to peel, a peel on the open; The peel of an orange is very hard to peel. Citrus peel is somewhere in between. The second is the color of the embryo in the seed, the orange embryo is white, orange embryo is green.

And why is grapefruit called grapefruit when it's clearly citrus? It is the superhybrid of the citrus family, and the marriage of the sweet orange and the grapefruit gave birth to the grapefruit. Even though it's called a grapefruit, this guy has nothing to do with grapes. They get their name because their fruit grows so densely on the branches that it looks like clusters of grapes from a distance.

     As fruit tree breeding, the deepening of the research on citrus family relationships, the citrus family more and more chaotic, many made mistake "" descendants" incest "is not clear which type to reduce them to, like a fire in the market now is ugly orange, orange, red peach varieties, breeding experts them collectively known as the hybrid citrus.

    As for citrus, it is the general name of orange, mandarin, orange, kumquat, pomelo, orange and so on. From a scientific point of view, oranges are the basic species, with small flowers, easy peel and dark green seeds. Orange is a hybrid of orange and sweet orange. The flower is big, the fruit is not as easy to peel as the orange, and the seed embryo is light green. Citrus and tangerine are woody plants of the same family, genus and species in plant taxonomy. In addition, both orange and orange are often collectively referred to as "citrus".