The four seasons orange is an evergreen shrub or small tree of Rutaceae and citrus. The tree is upright, with dense branches and leaves, many branches, spiny or non spiny, dark green leaf color, wavy blunt teeth on the leaf edge, and narrow wing leaves. The flower is white and fragrant. It blooms many times a year. The fruit is orange, round or oblate, often skewed and irregular. There are often small printing rings on the top of the fruit, with dense oil cells, which are lifelong or protruding. The pulp is 8 ~ 11 petals, sour and difficult to eat raw. It can be used instead of green lemon. The seed is polyembryonic and the embryo is green. Excellent viewing effect.