sunn hemp 
(sŭn)
(sŭn)n.
1. A tropical Asian plant (Crotalaria juncea) in the pea family, having clusters of yellow flowers.
2. A tough fiber obtained from the stems of this plant, used for cordage. In both senses also called sunn.
[Hindi san, from Sanskrit śāṇa-, hempen, from śaṇaḥ, hemp.]