Rhamni purshiani cortex

CASCARA, Rhamni purshiani cortex Cascara bark is more widely used than Frangula as a laxative in the USA since the trees of Rhamnus purshianus DC, family Rhamnaceae, are cultivated in Northwestern USA and Canada. Cascara has also been known as Cascara Sagrada from the Spanish name for sacred bark. Like the closely related Frangula bark, fresh Cascara bark contains reduced emodin-based glycosides. In order to convert these to milder oxidised forms the bark must either be stored for 1 year or heat treated. 

Fig. 4 Rhamni purshiani cortex Ca,scarac sagradae cortex...

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