An endangered new species of Podorungia (Acanthaceae), with notes on the tribe Barlerieae in Madagascar

Onjalalaina, Guy E.; Darbyshire, Iain

doi:10.1007/s12225-016-9657-2

Cited by 6 publications

(10 citation statements)

References 16 publications

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“…Including representatives of these genera in molecular studies will allow for clear delineation of genera and branching order in this variable lineage of Acanthaceae and shed light on patterns of morphological evolution. In particular, the sister clade to Barleria includes the recently expanded Crabbea , which may also eventually include Lasiocladus and potentially other Malagasy endemic genera (Onjalalaina & Darbyshire, ). The other Barlerieae that were sampled as outgroups are richly disparate biogeographically with some genera including African and NW species and at least one including Asian taxa as well (i.e., Lepidagathis ).…”

Section: Discussionmentioning

confidence: 99%

“…can be similar in pollen morphology but pollen of Barleria is notable for the depth of the reticulum. Crabbea and allied genera also differ from Barleria in having a calyx of five subregular to unequal segments (Onjalalaina & Darbyshire, ). The presence of double cystoliths in epidermal cells has previously been proposed as a useful trait for recognition of Barleria (Balkwill & Balkwill, ).…”

Section: Introductionmentioning

confidence: 99%

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Phylogenetic relationships among species of Barleria (Acanthaceae, Lamiales): Molecular data reveal complex patterns of morphological evolution and support a revised classification

Darbyshire

Fisher

Kiel

et al. 2019

TAXON

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Barleria is a genus of~300 species of herbs and shrubs in Africa and Asia, with highest diversity in tropical East Africa and southern Africa. The genus is part of Barlerieae (Acanthaceae), a lineage that is distinguished from other Acanthaceae by quincuncial corolla aestivation. Unequivocal synapomorphies have yet to be identified for Barleria. However, among Barlerieae, species of Barleria can be recognized by the combination of 4-partite calyces with the anterior and posterior lobes usually larger than the two lateral lobes, pollen with a coarsely reticulate (honeycomb) exine and the corolla limb variously subactinomorphic to strongly zygomorphic but never markedly bilabiate with a hooded upper lip. All Barleria that we have observed also have filaments that twist through 180°and cross just distal to the synstapetal zone. Barleria species have previously been classified into two subgenera and seven sections based on differences in leaf axil spine systems; configuration of the corolla, androecium and stigma; and morphology of the capsule and seed. We tested the subgeneric classification of Barleria by sampling 53 Barleria species and 9 outgroup species for three plastid intergenic spacers (trnS-G, ndhF-rpl32-trnL (UAG) ) and the nuclear region nrITS. We found a monophyletic Barleria and support for the two currently recognized subgenera; four of seven currently recognized sections are monophyletic but one of these four, sect. Fissimura, is nested within other sections. Species of sect. Fissimura unexpectedly resolved in subg. Barleria with strong support, although previous classifications placed the section in subg. Prionitis. We propose recognizing two subgenera (i.e., Barleria, Prionitis), the latter comprising three sections (i.e., Prionitis, Somalia, Stellatohirta). Barleria encompasses remarkable morphological diversity; we used an ultrametric tree to examine the evolution of nine morphological traits used to define infrageneric taxa in previous classifications. All characters evolved homoplasiously, but a few states (e.g., woody capsule septa) are supported as synapomorphies, and combinations of characters can be used to delimit subgenera. Members of subg. Barleria have 4-seeded capsules that lack a prominent beak, with a transition to 2-seeded capsules in the clade that corresponds to sect. Fissimura. In contrast, members of subg. Prionitis have 2-seeded capsules (reversed to 4-seeded in most members of one clade of sect. Somalia) that generally have a prominent beak. Additionally, we surveyed pollen morphology for 15 species sampled from across the classification. Pollen is consistently tricolporate with a coarse honeycomb exine. We provide an infrageneric classification and key to infrageneric taxa of Barleria.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phylogenetic relationships among species of Barleria (Acanthaceae, Lamiales): Molecular data reveal complex patterns of morphological evolution and support a revised classification

Darbyshire

Fisher

Kiel

et al. 2019

TAXON

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“…New species are regularly being described (e.g. Rakotoarinivo & Dransfield, 2010; Ralimanana et al, 2013; Vorontsova, 2014; Onjalalaina & Darbyshire, 2016; Rakotoarisoa & Grace, 2017; Ralimanana, 2017; Wilkin et al ., 2017; Lowry et al ., 2019; McPherson, 2019) and are often already highly threatened by the time they are discovered. Ex situ conservation offers options for conserving plants, providing an insurance policy against extinction in the wild.…”

Section: Figmentioning

confidence: 99%

Madagascar: A Biodiversity Hotspot Still Revealing Its Botanical Treasures

Clubbe¹,

Cable²,

Ralimanana³

2020

Curtis's Botanical Magazine

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“…Centers of endemism largely parallel centers of biodiversity worldwide. Madagascar almost certainly hosts the highest degree of endemism: of over 500 species of Acanthaceae, 93% are considered to be endemic (Onjalalaina & Darbyshire, 2016; Madagascar Catalogue, 2020). In addition to marked taxonomic diversity worldwide, Acanthaceae have a notably rich fossil record (Tripp & McDade, 2014).…”

Section: Introductionmentioning

confidence: 99%

Revised classification of Acanthaceae and worldwide dichotomous keys

Tripp

Darbyshire

Daniel

et al. 2021

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Acanthaceae are among the most taxonomically diverse, geographically widespread, and morphologically and ecologically variable lineages of flowering plants. Most modern workers have estimated more than 4000 species and potentially more than 5000 species worldwide, thus placing Acanthaceae among the 12 or so most diverse families of angiosperms. This diversity is marked by exceptional morphological variation, particularly with respect to floral forms, growth forms, and pollen types. The present work represents a synthesis of knowledge generated over the past two decades on the taxonomy and systematics of this complex plant family. We place all 191 accepted genera within a revised classification of the family. Dichotomous keys (nine in total) to recognize the major lineages of Acanthaceae are presented together with geographically partitioned keys to all genera, covering (a) Africa, Madagascar, the Mediterranean region, and Arabia; (b) Asia and Australasia; and (c) the Americas. Finally, we validate several new tribes, subtribes, and genera, and provide new combinations for species where generic delimitation has changed. Our hope is that the present contribution serves to benefit future research on the systematics of Acanthaceae and provides a foundation upon which future classification efforts can be built.

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An endangered new species of Podorungia (Acanthaceae), with notes on the tribe Barlerieae in Madagascar

Cited by 6 publications

References 16 publications

Phylogenetic relationships among species of Barleria (Acanthaceae, Lamiales): Molecular data reveal complex patterns of morphological evolution and support a revised classification

Phylogenetic relationships among species of Barleria (Acanthaceae, Lamiales): Molecular data reveal complex patterns of morphological evolution and support a revised classification

Madagascar: A Biodiversity Hotspot Still Revealing Its Botanical Treasures

Revised classification of Acanthaceae and worldwide dichotomous keys

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