Accepted By:
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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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Ridsdale, C. E. 2008. Thorny problems in the Rubiaceae: Benkara, Fagerlindia and Oxyceros. Reinwardtia 12(4): 289–300.
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