Origin
* Rheum palmatum L. et Rheum tangouticum Maxim. ex Reg.: Gansu, Qinghai.
* Rheum officinale Baill.: South China (predominantly: Sichuan).;
Preparation
The drug is collected in late autumn when stem and leaves are withered or in next spring just before budding, removed from rootlet and the outer bark, cut into segment or section, either stringed together to be dried, or dried directly.
The rhizome can also be processed with wine, carbonized, or steamed.;
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