ABSTRACT
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.