Applications and challenges of DNA barcoding in rapid radiation groups: Rhodiola(Crassulaceae) as a case study

Rhodiolae Crenulatae Radixet Rhizoma(Hongjingtian in Chinese, RCRR), the roots and rhizomes of Rhodiola crenulataand its application in the medicinal market is very chaotic. In this study, DNA barcoding database and identification engine of Rhodiolaspecies were established, decoction pieces from the medicinal market were identified, and the application and challenges of DNA barcoding in the rapid radiation of Rhodiolaspecies were analyzed. This study provides reference for the protection, rational development, and utilization of endangered resources within Rhodiolaspecies.