Peanut flower. The peanut is an annual herbaceous plant growing 30 to 50 centimetres (12 to 20 in) tall. [9] As a legume, it belongs to the botanical family Fabaceae, also known as Leguminosae, and commonly known as the legume, bean, or pea family. [1] Like most other legumes, peanuts harbor symbiotic nitrogen-fixing bacteria in their root nodules. [7]The leaves are opposite and …