CINCHONA TREE

C. officinalis

, and of hybrids of these and of other species of

Cinchona,

yielding, when assayed by a prescribed process, not less than 5% of total alkaloids.

Cinchona rubra

,

red cinchona

, is the bark of

C. Succirubra

or of its hybrids, containing not less than 5% of cinchona alkaloids. From it is prepared the compound tincture of cinchona.