Huang, Q.-L.; Fei, W.-Q.; Wu, H.-S.; Yuan, Q.; Yang, Q.-E. Clematis chengguensis and C. Retusifolia (Ranunculaceae), Both Described from Shaanxi of China, Are Merged with C. armandi, a Widely Distributed Species in the Country. Phytotaxa 2024, 669, 211-232.