Recent phylogenetic analysis of the Old World species of Passiflora has indicated that two monotypic genera in the Passifloraceae, Hollrungia and Tetrapathea, are strongly supported as belonging to the genus Passiflora. Additionally, a new species from Australia was found to belong to the same clade as Hollrungia and Tetrapathea. Consequently, a taxonomic revision is presented here of Passiflora subgenus Tetrapathea including these three taxa. Tetrapathea tetrandra, the type of Passiflora subgenus Tetrapathea and historically recognized as both T. tetrandra and P. tetrandra, is formally accepted here as P. tetrandra. The single species of Hollrungia, H. aurantioides, is transferred to Passiflora subgenus Tetrapathea as Tetrapathea P. aurantioides. The new and so far unnamed species in Passiflora subgenus Tetrapathea from Australia is also described as P. kuranda sp. nov.
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