For Coptis
Ford, B.A. 1997f. Coptis. In Flora of North America Editorial Committee. 1997. Flora of North America north of Mexico. Volume 3, Magnoliophyta: Magnoliidae and Hamamelidae. Oxford Univ. Press, New York, NY. 590 pp.
Tamura. 1993. In Kubitzki, K., J.G. Rohwer, and V. Bittrich, eds. 1993. The families and genera of vascular plants. II. Flowering plants – Dicotyledons – Magnoliid, Hamamelid and Caryophyllid families. Springer, Berlin. 653 pp.
Xiang, K.-L., S.-D. Wu, S.-X. Yu, Y. Liu, F. Jabbour, A.S. Erst, L. Zhao, W. Wang, Z.-D. Chen. 2016. The first comprehensive phylogeny of Coptis (Ranunculaceae) and its implications for character evolution and classification. PLOS One. DOI:10.1371/journal.pone.0153127.
Zhai, W., X. Duan, R. Zhang, C. Guo, L. Li, G. Xu, H. Shan, H. Kong, and Y. Ren. 2019. Chloroplast genomic data provide new and robust insights into the phylogeny and evolution of the Ranunculaceae. Molec. Phylogen. Evol. 135: 12-21.
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