Accepted By:
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Flora of China Editorial Committee. 1998. Flora of China (Scrophulariaceae through Gesneriaceae). 18: 1–449. 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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Taylor, C. M. 2010-2025. Studies in Tropical Rubiaceae.
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