Fig. 2From: Rapid differentiation of Xihuangcao from the three Isodon species by UPLC-ESI-QTOF-MS/MS and chemometrics analysisPhotos of some of the commercial Xihuangcao samples collected in this study: a, b I. lophanthoides var. graciliflorus, c I. serra and d Ampelopsis grossedentata Back to article page