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.

本品为茜草科植物纳（纳）Cinchona pubescens Vahl (Cinchona succirubra Pavon)、白纳C. calisaya (Weddell)、纳C. ledgeriana (Moens ex Trimen)及其变种及杂交品种的完整或切段的干燥皮。