Phylogenetic relationships and generic realignments in the early diverging subtribe Pentziinae (Asteraceae, Anthemideae). (12th June 2015)

• Record Type: Journal Article
• Authors: Magee, Anthony R.; Nicolas, Antoine N.; Tilney, Patricia M.; Plunkett, Gregory M.
• Is Part Of: Botanical journal of the Linnean Society. Volume 178:Number 4(2015:Aug.)
• Page Start: 633
• Page End: 647
• Publication Date: 2015-06-12
• Subjects: Botany -- Periodicals; 580
• DOI: 10.1111/boj.12295
• Languages: English
• ISSNs: 0024-4074

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Pentziinae are a subtribe of tribe Anthemideae (Asteraceae), comprising seven almost exclusively southern African endemic genera and <italic>c</italic>. 60 species. Generic delimitations and relationships in the subtribe are explored using parsimony and Bayesian analyses of nuclear (internal transcribed spacer, ITS) and plastid (<italic>ndhF</italic>, <italic>psbA</italic>‐<italic>trnH</italic>, <italic>trnK</italic>‐<italic>rps16</italic> and <italic>rpl32</italic>‐<italic>trnL</italic>) DNA regions, with morphological and fruit anatomical studies. Phylogenetic analyses for 72 accessions (43 species) representing 72% of the subtribe indicate that several of the genera are not monophyletic as currently circumscribed. <italic>Pentzia tortuosa</italic> differs from its congeners in its inconspicuously three‐ribbed fruits and in several other distinctive morphological characters. In the phylogenetic trees based on the nuclear dataset, <italic>P. tortuosa</italic> is recovered in the perennial clade with its congeners, but in the plastid data set, it is strongly placed among the early diverging lineages comprising annual taxa with three‐ribbed fruits. Even with the exclusion of <italic>P. tortuosa</italic>, <italic>Pentzia</italic> remains paraphyletic by the inclusion of at least <italic>Rennera</italic> and possibly also <italic>Cymbopappus</italic> and <italic>Marasmodes</italic>. A possible sister relationship between <italic>Marasmodes</italic> and <italic>Pentzia</italic>, however, cannot be excluded. The four <italic>Rennera</italic> specise are therefore here transferred to <italic>Pentzia</italic>, whereas <italic>Marasmodes</italic> and <italic>Cymbopappus</italic> are retained pending further investigation. Among the annual lineages, <italic>Foveolina</italic> is also found to be polyphyletic, with <italic>F. dichotoma</italic> (the type species) and <italic>F. tenella</italic> clearly allied with <italic>Oncosiphon</italic>, and the anomolous species, <italic>F. burchellii</italic>, recovered with <italic>Myxopappus</italic> in the nuclear trees. Both <italic>Myxopappus</italic> species share the disciform capitula and heteromorphic fruits with <italic>Foveolina burchellii</italic> (characters previously overlooked in <italic>Myxopappus</italic> and reported here for the first time). © 2015 The Linnean Society of London, <italic>Botanical Journal of the Linnean Society</italic>, 2015, <bold>178</bold>, 633–647.</p> </abstract>