Accepted By:
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Backlund, M., B. Bremer & M. Thulin. 2007. Paraphyly of Paederieae, recognition of Putorieae and expansion of Plocama (Rubiaceae-Rubioideae). Taxon 56(2): 315–328.
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Flora of China Editorial Committee. 2011. Flora of China (Curcurbitaceae through Valerianaceae with Annonaceae and Berberidaceae). 19: 1–884. In C. Y. Wu, P. H. Raven & D. Y. Hong (eds.) Fl. China. Science Press & Missouri Botanical Garden Press, Beijing & St. Louis.
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Lorence, D. H. 1999. A nomenclator of Mexican and Central American Rubiaceae. Monogr. Syst. Bot. Missouri Bot. Gard. 73: 1–177.
 
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Nasir, E. & S. I. Ali (eds). 1980-2005. Fl. Pakistan Univ. of Karachi, Karachi.
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Schatz, G. E., S. Andriambololonera, P. P. Lowry II, P. B. Phillipson, M. Rabarimanarivo, J. I. Raharilala, F. A. Rajaonary, N. Rakotonirina, R. H. Ramananjanahary, B. Ramandimbisoa, A. Randrianasolo, N. Ravololomanana, C. M. Taylor & J. C. Brinda. 2024. Catalogue of the Plants of Madagascar.
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