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Nymphoides is a genus of approximately 50 species worldwide, and arguably achieves its greatest diversity in tropical northern Australia, where most of the 20 native species occur. Species found at temperate latitudes are restricted to the eastern half of the country; of these, three (N. crenata, N. geminata, N. indica) also occur in the tropics, and two (N. montana and N. spinulosperma) are only temperate. During an ongoing phylogenetic study of the genus, DNA sequences from N. montana were a major source of incongruence between phylogenetic trees derived from nuclear (nrITS) and chloroplast (rbcL, trnK) data matrices. Our phylogenetic analysis revealed that N. montana resolved variously with N. geminata (nuclear data) and N. spinulosperma (chloroplast data), which despite their strong morphological similarity, are not closely related to each other. These results indicate a hybrid origin for N. montana, which subsequently retains evidence of its maternal lineage in the chloroplast genome, whereas nuclear DNA markers (nrITS data) have been converted to resemble the paternal lineage exclusively.

Evidence for the hybrid origin of Nymphoides montana Aston (Menyanthaceae)