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Joosia subg. Sectocalyx Steyerm.
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Andersson, L. 1997. A new revision of Joosia (Rubiaceae--Cinchoneae). Brittonia 49(1): 24–44.
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Taylor, C. M. 2010-2025. Studies in Tropical Rubiaceae.
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Taylor, C. M. 2017. Another taxonomic review of the Neotropical genus Joosia (Rubiaceae, Cinchoneae). Novon 25(2): 214–237.
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