The vicinities of Yelpin have always been known for their abundance of alpine herbs and officinal plants.
2.
"' Officinal "'is a term applied in medicine to prescriptions authorized by a pharmacopoeia.
3.
He was an industrious student of botany, but passed his last years in great penury, earning a scanty living by digging officinal roots for the druggists.
4.
The dried bark, however, is still an officinal drug and is listed in the modern Chinese materia medica as " chun bai pi " ( ), meaning " white bark of spring ".
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