The genus Hexopetion Burret (Arecaceae)

Pintaud, Jean‐Christophe; Millán, Betty; Kahn, Francis

doi:10.15381/rpb.v15i3.2935

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…Infrageneric relationships in Bactridinae. As resolved here and previously by Eiserhardt et al (2011), Ludena et al (2011), and Roncal et al (2013, the controversial segregation of Hexopetion from Astrocaryum (Pintaud et al, 2008) does not violate monophyly, but we support recognition at a subspecific rank rather than as a sister genus. Bactris, the largest genus of Bactridinae with 73 species (Henderson, 2000), is consistently split into two subclades in all of our supermatrix analyses (Figs 1 and 2) with good support.…”

Section: Phylogeny Of Bactridinaesupporting

confidence: 85%

Phylogeny and historical biogeography of the cocosoid palms (Arecaceae, Arecoideae, Cocoseae) inferred from sequences of six WRKY gene family loci

et al. 2014

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Arecaceae tribe Cocoseae is the most economically important tribe of palms, including both coconut and African oil palm. It is mostly represented in the Neotropics, with one and two genera endemic to South Africa and Madagascar, respectively. Using primers for six single copy WRKY gene family loci, we amplified DNA from 96 samples representing all genera of the palm tribe Cocoseae as well as outgroup tribes Reinhardtieae and Roystoneae. We compared parsimony (MP), maximum likelihood (ML), and Bayesian (B) analysis of the supermatrix with three species‐tree estimation approaches. Subtribe Elaeidinae is sister to the Bactridinae in all analyses. Within subtribe Attaleinae, Lytocaryum, previously nested in Syagrus, is now positioned by MP and ML as sister to the former, with high support; B maintains Lytocaryum embedded within Syagrus. Both MP and ML resolve Cocos as sister to Syagrus; B positions Cocos as sister to Attalea. Bactridineae is composed of two sister clades, Bactris and Desmoncus in one, for which there is morphological support, and a second comprising Acrocomia, Astrocaryum, and Aiphanes. Two B and one ML gene tree‐species estimation approaches are incongruent with the supermatrix in a few critical intergeneric clades, but resolve the same infrageneric relationships. The biogeographic history of the Cocoseae is dominated by dispersal events. The tribe originated in the late Cretaceous in South America. Evaluated together, the supermatrix and species tree analyses presented in this paper provide the most accurate picture of the evolutionary history of the tribe to date, with more congruence than incongruence among the various methodologies.

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Section: Phylogeny Of Bactridinaesupporting

confidence: 85%

Phylogeny and historical biogeography of the cocosoid palms (Arecaceae, Arecoideae, Cocoseae) inferred from sequences of six WRKY gene family loci

et al. 2014

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“…Hexopetion Burret, originally described by Burret (), was resurrected and expanded by Pintaud, Millán & Kahn () as a segregate of two species from Astrocaryum G.Mey. The characters presented to distinguish Hexopetion were multifold lateral leaflets in adults, the lack of a sterile portion of the rachilla between the basal pistillate flower and distal staminate flowers, white, woolly indumentum on the rachilla between the flowers, stigmas much shorter than the ovary and leaf vascular anatomical features.…”

Section: Genera Lost Since Gp2mentioning

confidence: 99%

BeyondGenera Palmarum: progress and prospects in palm systematics

2016

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The systematic biology of the palm family (Arecaceae) is probably better known than that of any other tropical plant family of comparable size. As a result, the palms are now regarded as a model group for tropical rain forest research. Ten years ago, the first phylogenetic classification of palms was established as a foundation for the second edition of the palm systematic synthesis, Genera Palmarum (GP2), which was published in 2008. Here, we review progress in palm systematics since GP2, summarizing the latest developments in an updated palm classification and schematic phylogenetic tree. To date, the palms comprise 181 genera and c. 2600 species. In just 8 years, six new genera and 200 new species have been described, whereas eight genera have been sunk into synonymy. This reflects the highly dynamic nature of systematic discovery of palms at both forest and phylogenetic frontiers. Palm phylogenetics is a vibrant field, with new trees being generated and utilized in increasingly innovative and ambitious ways. Existing understanding of relationships among the five subfamilies has been confirmed and deep nodes in the subfamilies are crystallizing, especially in subfamilies Arecoideae and Coryphoideae. We conclude that palm systematic knowledge is far from complete and that tools, such as GP2, only stimulate further scientific research and discovery. Despite recent advances, however, many aspects of the palm Tree of Life still remain scarcely known. The vast datasets that the phylogenomic revolution is now bringing to bear on palms promise to elucidate many of these unknowns. The ultimate goal, a species-level phylogenetic tree for palms, is now coming within reach.

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“…grow in a wide variety of habitats in primary or secondary lowland rainforests, such as riparian and swamp forests, white sand savannahs, terra firme on clayey soils, inter‐Andean valleys, semi‐arid cerrado vegetation and the Brazilian coastal Atlantic forest (Dransfield et al ., ; Kahn, ). The resurrection of the genus Hexopetion Burret as distinct from Astrocaryum has been proposed based on anatomical and morphological characters (Pintaud, Millán & Kahn, ; Millán & Kahn, ) to comprise two species ( H. alatum (H.F.Loomis) F.Kahn & Pintaud and H. mexicanum (Liebm. ex Mart.)…”

Section: Introductionmentioning

confidence: 99%

Cenozoic colonization and diversification patterns of tropical American palms: evidence fromAstrocaryum(Arecaceae)

et al. 2012

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With 788 species in 67 genera in the Neotropics, Arecaceae are an important ecological and economic component of the region. We review the influence of geological events such as the Pebas system, the Andean uplift and the land connections between South and Central/North America, on the historical assembly of Neotropical palms. We present a case study of the palm genus Astrocaryum (40 species) as a model for evaluating colonization and diversification patterns of lowland Neotropical taxa. We conducted a Bayesian dated phylogenetic analysis based on four low‐copy nuclear DNA regions and a biogeographical analysis using the dispersal, extinction and cladogenesis model. Cladogenesis of Western Amazonian Astrocaryum spp. (c. 6 Mya) post‐dated the drainage of the aquatic Pebas system, supporting the constraining role of Pebas on in situ diversification and colonization. The ancestral distribution of Astrocaryum spp. in the Guiana Shield supported the hypothesis of an old formation that acted as a source area from which species colonized adjacent regions, but an earliest branching position for Guianan species was not confidently recovered. A twofold increase in diversification rate was found in a clade, the ancestor of which occupied the Guiana Shield (c. 13 Mya, a time of climatic change and Andean uplift). © 2012 The Linnean Society of London, Botanical Journal of the Linnean Society, 2012, ●●, ●●–●●.

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The genus Hexopetion Burret (Arecaceae)

Abstract: The genus Hexopetion was described by Burret to accommodate a single species, H. mexicanum. We reinstate the genus on the basis of morphological and anatomical data, and enlarge it to include a second species, Astrocaryum alatum, for which a new combination is made.

Cited by 7 publications

References 14 publications

Phylogeny and historical biogeography of the cocosoid palms (Arecaceae, Arecoideae, Cocoseae) inferred from sequences of six WRKY gene family loci

Phylogeny and historical biogeography of the cocosoid palms (Arecaceae, Arecoideae, Cocoseae) inferred from sequences of six WRKY gene family loci

BeyondGenera Palmarum: progress and prospects in palm systematics

Cenozoic colonization and diversification patterns of tropical American palms: evidence fromAstrocaryum(Arecaceae)

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