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Yang, L.-E., Y. Meng, D.-L. Peng, Z.-L. Nie, and H. Sun. 2018. Molecular phylogeny of Galium L. of the tribe Rubieae (Rubiaceae) – Emphasis on Chinese species and recognition of a new genus Pseudogalium. Molec. Phyl. Evol. 126: 221-232.