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ZHOU, Y.-D., AMENU, S.G., MWACHALA, G., HU, G.-W. and WANG, Q.-F. 2021. Reinstatement of the independent specific status of <em>Oldenlandia violacea</em> (Rubiaceae) from the synonymy of <em>O. monanthos</em>. Phytotaxa. 507, 4 (Jun. 2021), 293–300. DOI:https://doi.org/10.11646/phytotaxa.507.4.3.