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金纳（纳树）Cinchona pubescens Vahl (Cinchona succirubra Pavon)、白金纳树C. calisaya (Weddell)、金纳树C. ledgeriana (Moens ex Trimen)及其变种及杂交品种的完整或切段的干燥树皮。