Phyllanthus marchionicus is a species of tree in the family Phyllanthaceae. It is endemic to the Marquesas Islands in French Polynesia, where it grows on the islands of Nuku Hiva, Ua Pou, Ua Huka, Hiva Oa, Tahuata, and Fatu Hiva, in a variety of habitats.Florence, J. (1997) Flore de la Polynésie française, vol. 1. Paris: Éditions de l'ORSTOM.
Glochidion tooviianum was described as a species endemic to the Toovii Plateau on Nuku Hiva by Jacques Florence in 1996. Plants of the World Online considers it a synonym of Phyllanthus marchionicus, as both species are indistinguishable except for the presence of pubescence on G. tooviianum and the absence of pubescence on P. marchionicus/G. marchionicum.Wagner, W. L.; Lorence, D. H. (2011) "A nomenclator of Pacific Island Phyllanthus, including Glochidion. PhytoKeys. 4: 67–94.
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