A generic classification of the Restioneae (Restionaceae), southern Africa

Linder, H. Peter; Hardy, Christopher R.

doi:10.4102/abc.v40i1.178

Cited by 12 publications

(17 citation statements)

References 32 publications

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“…There a phylogeny based on comprehensive sequencing of atpB-rbcL, trnL-F and trnK, together with morphological features, covered 317 species of Restionaceae (Hardy & al., 2008). In revising the generic classification in response to their phylogenetic findings, Linder & Hardy (2010) state that their classification "represents our attempt to optimize our adherence to the following criteria; 1, monophyly; 2, diagnosability; 3, nomenclatural stability; and 4, informativeness". Their classification recognises one new genus but greatly enlarges the limits of Restio, synonymising within it three formerly recognised genera.…”

Section: Characterising An Enlarged Restionaceae and Subfam-mentioning

confidence: 99%

“…Restionaceae (currently 47 genera [but expected to be reduced to 42, as indicated below], about 456 species) is in southern Africa and Australasia with one species each in Madagascar, coastal Chile and from Malesia to Hainan Island (Briggs, 2001). (Numbers of genera and species recognised are from Briggs & Linder, 2009, modified to take account of Linder & Hardy, 2010;Briggs & al., 2012;Wagstaff & Clarkson, 2012. ) Within Restionaceae three subfamilies are recognised (Briggs & Linder, 2009), supported principally by DNA-based phylogenies Linder & al., 2003Moline & Linder, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…A phylogeny based on comprehensive sampling of three chloroplast genes (rbcL-atpB, trnL-F, matK + flanking trnK) and on morphological features has been developed for the African members (Hardy & al., 2008). This indicated that substantial changes were needed in the generic classification of tribe Restioneae in order to recognise monophyletic groups and changes were subsequently made by Linder & Hardy (2010). As a result, seven genera are now accepted in tribe Restioneae, whereas eleven had formerly been recognised.…”

Section: Introductionmentioning

confidence: 99%

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Phylogeny of the restiid clade (Poales) and implications for the classification of Anarthriaceae, Centrolepidaceae and Australian Restionaceae

Briggs

Marchant

Perkins

2014

TAXON

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Three families, Anarthriaceae, Restionaceae and Centrolepidaceae, are generally recognised in the restiid clade of Poales. A new phylogeny is presented, with fuller sampling of Australian taxa, based on analyses of trnL‐F, trnK and rbcL data from the chloroplast genome. The findings agree with the major groups shown in previous molecular studies but provide a more substantial basis for reviewing the classification at family and generic levels. Anarthriaceae is sister to Restionaceae, with Anarthria sister to Lyginia+Hopkinsia. Centrolepidaceae, on an extremely long branch, appears embedded in Restionaceae in Bayesian trees; although it appears as sister to Restionaceae in analyses that are more subject to long‐branch attraction (in parsimony analyses and those of data from the less‐conserved trnL‐F cpDNA region). Accepting the embedded position, which would make this a subfamily of Restionaceae, the basal division in the Restionaceae separates the African subfamily Restionoideae from the Australasian clade (Sporadanthoideae, Centrolepidoideae, Leptocarpoideae). In subfamily Leptocarpoideae, Eurychorda forms the basal branch. At the next dichotomy the Leptocarpus clade, together with the Winifredia clade, is separated from a diverse assemblage including Loxocarya, Chordifex, Baloskion, Desmocladus, Lepidobolus and allied genera. The phylogeny indicates that several currently recognised genera are not monophyletic and that changes to the generic classification are required. A matrix of morphological characters was prepared and these were mapped onto the Bayesian consensus DNA tree to identify synapomorphies of the clades and genera. Observations on leaf laminae indicate that fully or partially unifacial leaf laminae are a synapomorphy of the restiid clade. The morphological characterisation of the following are considered: the restiid clade, Anarthriaceae, Restionaceae enlarged to include subfamily Centrolepidoideae, Leptocarpus s.l. (including as potential synonyms Meeboldina and Stenotalis) and Desmocladus s.l. (including potentially Harperia, Onychosepalum and Kulinia).

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Section: Characterising An Enlarged Restionaceae and Subfam-mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phylogeny of the restiid clade (Poales) and implications for the classification of Anarthriaceae, Centrolepidaceae and Australian Restionaceae

Briggs

Marchant

Perkins

2014

TAXON

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“…The South African Restionaceae (restiads) represent one of the largest (>300 species) and most intensely studied plant radiations of southern Africa (Linder ; Hardy et al . ; Linder & Hardy ). These reed‐like graminoids form ecologically important elements of the hyperdiverse fynbos biome of the CFR (Goldblatt & Manning ).…”

Section: Introductionmentioning

confidence: 99%

“…The well‐developed phylogeny for Restionaceae (Hardy et al . ; Linder & Hardy ; Litsios et al . ), available knowledge on their physiological and phenological responses to water logging and drought (Araya et al .…”

Section: Introductionmentioning

confidence: 99%

Genomics of the divergence continuum in an African plant biodiversity hotspot, I: drivers of population divergence in Restio capensis (Restionaceae)

et al. 2014

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Understanding the drivers of population divergence, speciation and species persistence is of great interest to molecular ecology, especially for species-rich radiations inhabiting the world's biodiversity hotspots. The toolbox of population genomics holds great promise for addressing these key issues, especially if genomic data are analysed within a spatially and ecologically explicit context. We have studied the earliest stages of the divergence continuum in the Restionaceae, a species-rich and ecologically important plant family of the Cape Floristic Region (CFR) of South Africa, using the widespread CFR endemic Restio capensis (L.) H.P. Linder & C.R. Hardy as an example. We studied diverging populations of this morphotaxon for plastid DNA sequences and >14 400 nuclear DNA polymorphisms from Restriction site Associated DNA (RAD) sequencing and analysed the results jointly with spatial, climatic and phytogeographic data, using a Bayesian generalized linear mixed modelling (GLMM) approach. The results indicate that population divergence across the extreme environmental mosaic of the CFR is mostly driven by isolation by environment (IBE) rather than isolation by distance (IBD) for both neutral and non-neutral markers, consistent with genome hitchhiking or coupling effects during early stages of divergence. Mixed modelling of plastid DNA and single divergent outlier loci from a Bayesian genome scan confirmed the predominant role of climate and pointed to additional drivers of divergence, such as drift and ecological agents of selection captured by phytogeographic zones. Our study demonstrates the usefulness of population genomics for disentangling the effects of IBD and IBE along the divergence continuum often found in species radiations across heterogeneous ecological landscapes.

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