Peanut, groundnut, Chinese walnut - Arachis hypogaea L.
The Legume Family - Fabaceae Lindl.
peanuts peanut

Peanut, groundnut. 1 - the top part of escape; 2 - the flower bracts (side view); 3 - the fruit (General view); 4 - the fruit, the upper part of the hull is removed; 5 - the seed; 6 - semiadalia with the embryo.

The name of the plant was due to the fact that its fruits are developing in the soil.
This annual plant with height of 27-45 cm, with erect, slightly branching stalk. Leaves paripinnate, sitting on petioles. Bright orange or yellow flowers are collected in the brush. Soon after pollination flower peduncle, growing right, down, penetrating into the soil and there is the development of the fetus. In this regard, to create a permanent layer of loose soil, with the appearance of the flowers of the plant it is necessary to loosen and Spud. The fruit is unilocular cylindrical Bob, wearing loose mesh skin, constricted in the middle. Seeds are often two, form their angular, the color of the skin dark brown.
Homeland peanut - Brazil. Cultivated in tropical and subtropical countries of the globe. The largest areas are in India, China, Africa, USA, Brazil. In the USSR grows in the Caucasus, Transcaucasia, Ukraine and Central Asia.
Seeds contain 40-50% non-drying oil, 20-35% protein, starch, vitamin E, sugar. Pharmaceutical raw material is peanut butter, it is included in the Pharmacopoeia IX. In addition, peanuts are used in the food and confectionery industry.