Oranges generally mature in autumn and winter, and the fruiting period is from October to December.

The fruit has various shapes, usually oblate to nearly spherical. The peel is very thin and smooth, or thick and rough, and can be light yellow, vermilion or dark red. It is easy or slightly easy to peel off and has many orange veins. Or less, reticular, easy to separate, usually tender, the central column is large and often empty. It is sparse and full, and the floating sac has 7-14 valves. More rare. The cyst wall is thin or slightly thick, soft or quite tough, the pulp is sour or sweet, or has a specific smell, and the seeds are more or less numerous. Usually oval, with a narrow pointed top and a rounded base. The cotyledons are dark green, light green or almost milky white, with multiple embryos and rarely single embryos. The flowering period is from April to May, and the fruiting period is from October to December.

Extended information:

"Citrus" is different from "tangerine": "citrus" can refer to all fruits of the genus citrus, including pomelo, tangerine, tangerine, orange, etc.; while "tangerine" "Gan" is synonymous with orange in some dialects.

Both mandarins and tangerines belong to the wide-skinned citrus species of the Rutaceae family. The fruit has a thick outer skin and a fleshy valve inside, which is composed of juice bubbles and seeds. Li Shizhen recorded in "Compendium of Materia Medica·Fruit": "Orange fruit is small, its petals taste slightly vinegary (i.e. sour), its skin is thin and red, and it tastes pungent and bitter; mandarin oranges are larger than oranges, their petals taste vinegary, and their skin is slightly bitter. Thick and yellow, the leaves are pungent and sweet. "Generally speaking, the fruit of tangerine is round, yellow-red, with tight skin and fine lines, and is juicy and sweet; the fruit of tangerine is oblate, red or yellow, with thin and thin skin. Smooth and easy to peel, slightly sweet and sour taste. Although there are differences between tangerine and tangerine, they are often used interchangeably in daily language. For example, Guanggan is also called Guangtanger, and Mandarin is also called Satsuma.

Reference: Orange (a fruit of the genus Citrus in the family Rutaceae) - Baidu Encyclopedia