Origin:
Native to China; now mostly grown on the tea estates of Kangra Valley in Himachal Pradesh, and also in Assam and Bengal to provide shade for tea bushes.

Action:
Oil from seeds—purgative; employed externally in rheumatism; ulcers; also as a hair tonic.
Leaves— applied in acute rheumatism.
Fruit—carminative and expectorant.
Bark and flowers—used for asthma.

Khare, C.P./ Indian Medicinal Plants. -- Nueva Dheli: Springer, 2007 . - p. 836.