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The purpose of this study was to test the ability of DNA barcoding to identify the herbal raw trade of Tibetan medicine Dida in China. A reference database for plant-material DNA barcodes was successfully constructed and used to identify 36 commercially samples of Dida collected from Southwest China. The ITS sequence was amplified from these samples and the efficiency of the PCR amplification of ITS was 100%. The DNA sequencing results revealed that 3 samples (8.3%) were authenticated as Swertia chirayita, 2 sequences (5.6%) were authent