Definition: Whole or cut, dried bark of Cinchona pubescens Vahl (Cinchona succirubra Pavon), of C. calisaya (Weddell), of C. ledgeriana (Moens ex Trimen) or of its varieties or hybrids.
本品为茜草科植物柔毛纳(纳树)Cinchona pubescens Vahl (Cinchona succirubra Pavon)、纳树C. calisaya (Weddell)、纳树C. ledgeriana (Moens ex Trimen)及及杂交品的完整或切段的干燥树皮。