Phylogenetics and Taxonomy of the Tribe Merianieae

Michelangeli, Fabián A.; Dellinger, Agnes S.; Goldenberg, Renato; Almeda, Frank; Mendoza-Cifuentes, Humberto; Fernández‐Fernández, Diana; Ulloa, Carmen Ulloa; Penneys, Darin S.

doi:10.1007/978-3-030-99742-7_11

Cited by 3 publications

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References 50 publications

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“…Complementariamente, se consultó la más reciente filogenia de la tribu Merianeae (Michelangeli et al, 2022) y se realizó una sinopsis de las especies de Meriania con mayor semejanza a la nueva especie, que aquí se designa como un complejo asociado a M. selvaflorensis Humberto Mend. Para designar el complejo se compilaron microfotografías de tricomas y semillas de especies de Meriania presentes en la Cordillera Occidental y norte de la Cordillera Central de Colombia y utilizadas por Mendoza-Cifuentes (2021) en la revisión del género para Colombia.…”

Section: Materiales Y Métodosunclassified

“…En la filogenia más reciente de la tribu Merianeae, documentada por Michelangeli et al (2022), están incluidas las especies M. barbosae, M. selvaflorensis y M. silverstonei. Estas especies forman un único clado, hermano de la especie Meriania panamensis Gleason, que en conjunto está emparentado con el clado Macrophylla y no presenta una relación cercana con el grupo Brachycera.…”

Section: Sinopsis De Meriania Complejo Selvaflorensisunclassified

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Descripción de Meriania alexandrae (Melastomataceae, Merianieae), una nueva especie de Colombia y sinopsis del complejo Selvaflorensis

Posada-Herrera,

Mendoza-Cifuentes

2023

Acta Bot. Mex.

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Antecedentes y Objetivos: Meriania es un género neotropical de árboles y arbustos, con aproximadamente 120 especies distribuidas desde el sur de México hasta Brasil, Bolivia y las Antillas. En Colombia, asociado a las cordilleras Occidental y Central, se encuentra un complejo de especies de Meriania con caracteres únicos que permite diferenciarlo de otros grupos andinos; aquí se denomina complejo Selvaflorensis. El objetivo de este artículo es describir una nueva especie de Meriania asociada a este, además de documentar las especies de este grupo y sus distribuciones.Métodos: Basados en una recolección reciente, la revisión de ejemplares depositados en herbarios de Colombia, imágenes de ejemplares en JSTOR Global Plants y la consulta de bibliografía del género en Colombia, se describe e ilustra una nueva especie de Meriania y se categoriza siguiendo los criterios de la IUCN. Se establece el complejo Selvaflorensis dentro del género, se discuten sus relaciones, se documentan sus rasgos distintivos, y se presentan una sinopsis de las especies, una clave de identificación y un cuadro de caracteres para su reconocimiento.Resultados clave: Meriania alexandrae sp. nov. se reconoce por el hábito arbustivo, hojas subpeltadas con tricomas glandulares, flores con caliptras apiculadas y circuncísiles, los estambres dimorfos y semillas filiformes. Es endémica de Colombia y se sugiere su categoría de amenaza En Peligro (EN). Junto con otras cuatro especies, constituye el nuevo complejo aquí llamado Selvaflorensis que se caracteriza por la presencia de tricomas glandulares en hojas, flores caliptradas y semillas filiformes. Este complejo es restricto a la región biogeográfica llamada Cordillera Occidental de Colombia. Adicionalmente, dos paratipos antes asociados a Meriania silverstonei se resignan a esta nueva especie.Conclusiones: El complejo Selvaflorensis es un grupo natural dentro de Meriania restricto al norte de los Andes, conformado hasta el momento por cinco especies, y no está cercanamente emparentado con el grupo Brachycera.

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Section: Materiales Y Métodosunclassified

Section: Sinopsis De Meriania Complejo Selvaflorensisunclassified

Descripción de Meriania alexandrae (Melastomataceae, Merianieae), una nueva especie de Colombia y sinopsis del complejo Selvaflorensis

Posada-Herrera,

Mendoza-Cifuentes

2023

Acta Bot. Mex.

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The Sequential Direct and Indirect Effects of Mountain Uplift, Climatic Niche, and Floral Trait Evolution on Diversification Dynamics in an Andean Plant Clade

Dellinger,

Lagomarsino,

Michelangeli

et al. 2024

Systematic Biology

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Why and how organismal lineages radiate is commonly studied through either assessing abiotic factors (biogeography, geomorphological processes, climate) or biotic factors (traits, interactions). Despite increasing awareness that both abiotic and biotic processes may have important joint effects on diversification dynamics, few attempts have been made to quantify the relative importance and timing of these factors, and their potentially interlinked direct and indirect effects, on lineage diversification. We here combine assessments of historical biogeography, geomorphology, climatic niche, vegetative and floral trait evolution to test whether these factors jointly, or in isolation, explain diversification dynamics of a Neotropical plant clade (Merianieae, Melastomataceae). After estimating ancestral areas and the changes in niche and trait disparity over time, we employ Phylogenetic Path Analyses as a synthesis tool to test eleven hypotheses on the individual direct and indirect effects of these factors on diversification rates. We find strongest support for interlinked effects of colonization of the uplifting Andes during the mid-Miocene and rapid abiotic climatic niche evolution in explaining a burst in diversification rate in Merianieae. Within Andean habitats, later increases in floral disparity allowed for the exploitation of wider pollination niches (i.e., shifts from bee to vertebrate pollinators), but did not affect diversification rates. Our approach of including both vegetative and floral trait evolution, rare in assessments of plant diversification in general, highlights that the evolution of woody habit and larger flowers preceded the colonization of the Andes, but was likely critical in enabling the rapid radiation in montane environments. Overall, and in concert with the idea that ecological opportunity is a key element of evolutionary radiations, our results suggest that a combination of rapid niche evolution and trait shifts were critical for the exploitation of newly available niche space in the Andes in the mid-Miocene. Further, our results emphasize the importance of incorporating both abiotic and biotic factors into the same analytical framework if we aim to quantify the relative and interlinked effects of these processes on diversification.

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A A new species of Graffenrieda (Melastomataceae) from the northern Andes, Caquetá, Colombia, and a key for the Graffenrieda group with calyptrate flowers

Mendoza-Cifuentes,

Trujillo Trujillo

2024

Acta Bot. Mex.

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Background and Aims: Graffenrieda is a Neotropical genus with more than 70 species, mainly distributed in the Guiana Shield and the Andes. This work describes a new species of Graffenrieda and provides a key to identify all species with calyptrate flowers in the genus.Methods: The description of this new species was made from collections deposited in the Colombian herbaria JBB and COAH. Measurements of vegetative parts and inflorescence were made from dried material, while floral structures and fruits were measured from fresh material preserved in alcohol. Their conservation status was assessed according to IUCN guidelines. A key for the recognition of all species of the genus with calyptrate flowers, including the new species and Centronia species to be transferred to Graffenrieda is also provided here, for which lists of species in Neotropical countries, collection databases, and literature on both genera were consulted.Key results: Graffenrieda cardenasii sp. nov. is endemic to the southern Cordillera Oriental of Colombia and is characterized by its indumentum of irregular lepidote trichomes on the vegetative parts, leaves with incomplete lateral anisophylly, leafy bracteoles as large as the flower buds, 5-merous flowers, calyptrate calyx and 2-locular ovary. It is categorized as Endangered in view of its endemicity and habitat specificity. A key is provided for 30 species of the genus Graffenrieda that share the character of calyptrate flowers.Conclusions: This species is named in honor of the Colombian botanist Dairon Cárdenas López, a great collector and connoisseur of the Colombian Amazonian flora. It is so far known only from the type localities. The key to the species with calyptrate flowers included in this article allows 43% of the species in the genus Graffenrieda to be recognized, including four Centronia species.

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Phylogenetics and Taxonomy of the Tribe Merianieae

Cited by 3 publications

References 50 publications

Descripción de Meriania alexandrae (Melastomataceae, Merianieae), una nueva especie de Colombia y sinopsis del complejo Selvaflorensis

Descripción de Meriania alexandrae (Melastomataceae, Merianieae), una nueva especie de Colombia y sinopsis del complejo Selvaflorensis

The Sequential Direct and Indirect Effects of Mountain Uplift, Climatic Niche, and Floral Trait Evolution on Diversification Dynamics in an Andean Plant Clade

A A new species of Graffenrieda (Melastomataceae) from the northern Andes, Caquetá, Colombia, and a key for the Graffenrieda group with calyptrate flowers

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