Peanuts are annual herbs. It takes a little more than a month to grow from seeding to flowering, and the flowering period is more than two months. Its flowers are solitary or clustered in the axillary department, and one or two hundred of them are less than one or two hundred.
After the peanut blossoms are pollinated, the ovary stalks of the base of the ovary are elongated, and a fruit needle grows from the withered flower tube, which is purple. The needle lengthwise lengthwise. It grows up first, and a few days later, the ovary hilt hangs down on the ground. In the process of extension, the epidermal cells of the ovary are woody to protect the young fruit needle into the soil.
When the needle reaches 5 ~ 6cm, the ovary begins to lie flat, the mast becomes white, the body surface grows the fuzz, and can absorb the water and various nutrients directly for the growth and development needs. One seed after another, the skin shriveled and the pod gradually matured, forming the peanut fruit we saw.
The result of the underground flowering is an inherent genetic characteristic of peanut and a result of long-term adaptation to special environment. The peanut results in a dark, moist and mechanical stimulation of the ecological environment. These factors have become an indispensable condition for the growth and development of pod. Therefore, in order to survive and spread the seed, it only has to put the ovary into the soil to produce the fruit.
