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Julius, A., Kamin, I., Kiew, R. and Utteridge, T.M. 2013. Gardneria and Spigelia (Loganiaceae), two genera new to the Flora of Peninsular Malaysia. Phytotaxa. 129, 1 (Sep. 2013), 39–46. DOI:https://doi.org/10.11646/phytotaxa.129.1.3.