sunn
(Crotalaria juncea), plant of the pea family (Fabaceae, or Leguminosae) or its fibre, one of the bast fibre group. The plant is also cultivated in many tropical countries as a green manure crop that is plowed under to fertilize soil. The sunn plant is not a true hemp. It is probably native to the Indian subcontinent, where it has been cultivated since prehistoric times. It was introduced to the Western Hemisphere early in the 19th century.
Learn more about sunn with a free trial on Britannica.com.