Groundnut or Peanut

Usually, peanuts are rich in proteins which is healthy to human body.  The peanut, or groundnut (Arachis hypogaea), is a species in the legbum or "bean" . The peanut was probably first cultivated in the valleys of peanuts. It is annual herbous  plant growing 30 to 50 cm (1.0 to 1.6 ft) tall. The leaves  are opposite, pinnate with four leaflets (two opposite pairs; no terminal leaflet), each leaflet 1 to 7 cm (⅜ to 2¾ in) long and 1 to 3 cm (⅜ to 1 inch) broad. The flours are a typical pea flower in shape, 2 to 4 cm (0.8 to 1.6 in) (¾ to 1½ in) across, yellow with reddish veining. Hypogaea means "under the earth", after pollination, the flower stalk elongates causing it to bend until the ovary touches the ground.

 

Like this way the groundnuts are planted in villages of south India. It requires less water.