The monotypic genus Oceanopapaver is an endemic shrub found growing on serpentine soils in New Caledonia. Since the description of Oceanopapaver neocaledonicum by A. Guillaumin in 1932, five families have been suggested for it: Capparaceae, Cistaceae, Oceanopapaveraceae, Papaveraceae, and Tiliaceae. Phylogenetic analyses using DNA sequences of the chloroplast genes rbcL and ndhF strongly support the inclusion of Oceanopapaver in a clade of former Tiliaceae, Grewioideae (Malvaceae s.l.). Within Grewioideae, Oceanopapaver is nested within the pantropical genus Corchorus.
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Whitlock et al. (2003) studied this question.
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