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Geography and admixture shape the genome‐scale phylogeny of North American Delphinium.

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Title: Geography and admixture shape the genome‐scale phylogeny of North American Delphinium.
Authors: Meek, Jared B.1,2 (AUTHOR) jared.meek@columbia.edu, Cook, Daniel3 (AUTHOR), Bushman, B. Shaun4 (AUTHOR), Thorsted, Kim4 (AUTHOR), Eaton, Deren A. R.1 (AUTHOR) de2356@columbia.edu
Source: New Phytologist. May2026, Vol. 250 Issue 3, p1934-1947. 14p.
Subjects: Delphinium, Phylogeny, Species hybridization, Genomics, Nature conservation, Taxonomy, Biogeography
Abstract (English): Summary: The genus Delphinium exemplifies the complexity of plant diversification in mountainous regions, where rapid speciation, hybridization, and morphological convergence frequently obscure species boundaries. The North American lineage Delphinium sect. Diedropetala has rapidly radiated across a range of ecological habitats, from alpine tundra to desert grasslands, forming an iconic component of western wild flower communities.Here, we present a genome‐scale phylogeny of 34 taxa using ddRAD‐seq data from 150 individuals sampled across their geographic ranges.Our results reveal strong phylogenetic structure corresponding to biogeographic regions, including several well‐supported clades that cut across existing taxonomic subsections, emphasizing the need for taxonomic revision. Hybridization and introgression are widespread, occurring both within and between these regional clades. Most species are connected through a syngameon‐like network of introgression, with few widespread species acting as central hubs. We describe six higher‐level clade names and use an agent‐based artificial intelligence analysis to identify morphological synapomorphies that align with our genomic findings.Our study demonstrates that geography and gene flow have played a dominant role in shaping the evolutionary history of Delphinium in North America, offering a framework for revising its taxonomy and informing future conservation efforts. [ABSTRACT FROM AUTHOR]
Abstract (Spanish): Resumen: El género Delphinium ejemplifica la complejidad de la diversificación vegetal en regiones montañosas, donde la especiación rápida, la hibridación y la convergencia morfológica frecuentemente oscurecen los límites entre las especies. El linaje norteamericano Delphinium sect. Diedropetala se ha irradiado rápidamente a través de una variedad de hábitats ecológicos, desde la tundra alpina hasta los pastizales desérticos, formando un componente icónico de las comunidades de flores silvestres del oeste. A pesar de décadas de estudio taxonómico, las relaciones filogenéticas dentro de este grupo siguen sin resolverse adecuadamente.Aquí, presentamos una filogenia a escala genómica de 34 taxones utilizando datos de ddRAD‐seq de 150 individuos muestreados a lo largo de sus rangos geográficos.Nuestros resultados revelan una fuerte estructura filogenética correspondiente a regiones biogeográficas, incluyendo varios clados bien respaldados que atraviesan las subsecciones taxonómicas existentes, enfatizando la necesidad de una revisión taxonómica. La hibridación y la introgresión están muy extendidas, ocurriendo tanto dentro como entre estos clados regionales. La mayoría de las especies están conectadas a través de una red de introgresión tipo singameón, con unas pocas especies de amplia distribución actuando como núcleos centrales. Describimos seis nombres de clados de nivel superior y utilizamos un análisis de inteligencia artificial basado en agentes para identificar sinapomorfías morfológicas que se alinean con nuestros hallazgos genómicos.Nuestro estudio demuestra que la geografía y el flujo génico han desempeñado un papel dominante en la configuración de la historia evolutiva de Delphinium en América del Norte, ofreciendo un marco para revisar su taxonomía e informar futuros esfuerzos de conservación. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Summary: The genus Delphinium exemplifies the complexity of plant diversification in mountainous regions, where rapid speciation, hybridization, and morphological convergence frequently obscure species boundaries. The North American lineage Delphinium sect. Diedropetala has rapidly radiated across a range of ecological habitats, from alpine tundra to desert grasslands, forming an iconic component of western wild flower communities.Here, we present a genome‐scale phylogeny of 34 taxa using ddRAD‐seq data from 150 individuals sampled across their geographic ranges.Our results reveal strong phylogenetic structure corresponding to biogeographic regions, including several well‐supported clades that cut across existing taxonomic subsections, emphasizing the need for taxonomic revision. Hybridization and introgression are widespread, occurring both within and between these regional clades. Most species are connected through a syngameon‐like network of introgression, with few widespread species acting as central hubs. We describe six higher‐level clade names and use an agent‐based artificial intelligence analysis to identify morphological synapomorphies that align with our genomic findings.Our study demonstrates that geography and gene flow have played a dominant role in shaping the evolutionary history of Delphinium in North America, offering a framework for revising its taxonomy and informing future conservation efforts. [ABSTRACT FROM AUTHOR]
ISSN:0028646X
DOI:10.1111/nph.71042