The root of Bryonia alba, and of Bryonia dioica.

Characters. - In transverse sections about two inches (5 centimetres) in diameter, the bark grey-brown, rough, thin, the central portion whitish or greyish, with numerous small wood-bundles arranged in circles and projecting, radiating lines; inodorous, taste disagreeably bitter.

Preparation.

Dose.

Tinctura Bryoniae................................................................

2-10 fl. dr.

Composition. - It contains a bitter principle, bryonin. Use. - Its chief use was that of a hydragogue cathartic, but it is now superseded by jalap.