Abstract

The taxonomy of Linderniaceae has been considered difficult, particularly in the establishment of a stable generic framework. The prevailing approach in Australia and globally has been to adopt a broad concept of <i>Lindernia</i> encompassing several segregates that have at various times been recognised as genera or subgeneric taxa. A recent global conspectus drawing on molecular phylogeny returned <i>Lindernia</i> to a narrower circumscription and also retained several long-recognised and more recently established genera. It included a polyphyletic <i>Vandellia</i>, encompassing many Australian species previously accepted as belonging in <i>Lindernia</i>. Here, we test these generic concepts using the phylogenetic analysis of plastid <i>mat</i>K DNA sequences, including representatives of Australian Linderniaceae. We propose a generic taxonomy that resolves existing polyphyly and balances the need for name changes against the information conveyed by generic names. Our concept of <i>Lindernia</i> recognises three monophyletic subgenera. Evidence is insufficient to determine whether <i>Micranthemum</i> should be subsumed in <i>Lindernia</i> or remains a close ally with a sister relationship to it. In light of our findings, we return most of the Australian species to <i>Lindernia</i>; we also establish for the first time: <i>Lindernia</i> subg. <i>Ilysanthes</i> (Raf.) Wannan, W.R.Barker & Y.S.Liang, based on <i>Ilysanthes</i> Raf.; a replacement name <i>Yamazakia</i> W.R.Barker, Y.S.Liang & Wannan for <i>Tittmannia</i> Rchb. <i>nom. rej</i>., with consequential combinations <i>Y. viscosa</i> (Hornem.) W.R.Barker, Y.S.Liang & Wannan, based on <i>Gratiola viscosa</i> Hornem. and <i>Y. pusilla</i> W.R.Barker, Y.S.Liang & Wannan, based on <i>Gratiola pusilla</i> Willd.; and, in expanding <i>Torenia</i>, the combination <i>Tor. anagallis</i> (Burm.f.) Wannan, W.R.Barker & Y.S.Liang, based on <i>Ruellia anagallis</i> Burm.f.

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