Two new species of Siphocampylus (Campanulaceae, Lobelioideae) from the Central Andes

Lagomarsino, Laura P.; Santamaría-Aguilar, Daniel

doi:10.3897/phytokeys.58.6973

Cited by 3 publications

(2 citation statements)

References 12 publications

(21 reference statements)

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“…The peruvianids, a subclade of robust shrubs with large red or white flowers that is restricted to the Central Andes of Peru and Bolivia and represented by nine tips in our sampling (C. dianae, C. simulans, C. perlongus, C. viriduliflora, C. mandonis, C. brittonianus, and three accessions of C. incanus), is strongly supported as monophyletic in all analyses (1/1/100/100). The umbellatus group, represented by five species in our sampling, is phenotypically similar to the peruvianid subclade, though these species produce capsules and not berries; these robust shrubs include species with both typically hummingbird (e.g., S. boliviensis) and bat (e.g., S. tunicatus) pollinated flowers(Lagomarsino and Santamaría-Aguilar 2016). The relationships between species in the umbellatus group differ across analyses; it is monophyletic in the ASTRAL analysis (0.74) and a grade or unresolved in the remainder.…”

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confidence: 95%

Increased resolution in the face of conflict: phylogenomics of the Neotropical bellflowers (Campanulaceae: Lobelioideae), a rapid plant radiation

Lagomarsino

Frankel

Uribe‐Convers

et al. 2022

Preprint

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Background and Aims- The centropogonid clade (Lobelioideae: Campanulaceae) is an Andean-centered rapid radiation characterized by repeated convergent evolution of morphological traits, including fruit type and pollination syndromes. While previous studies have resolved relationships of lineages with fleshy fruits into subclades, relationships among capsular species remain unresolved. This lack of resolution has impeded reclassification of non-monophyletic genera, whose current taxonomy relies heavily on traits that have undergone convergent evolution. Methods- Targeted sequence capture using a probeset recently developed for the centropogonid clade was used to obtain phylogenomic data from DNA extracted from both silica-dried and herbarium leaf tissue. These data were used to infer relationships among species using concatenated and partitioned species tree methods, and to quantify gene tree discordance. Key Results- While silica-dried leaf tissue resulted in more and longer sequence data, the inclusion of herbarium samples improved phylogenetic reconstruction. Relationships among baccate lineages are similar previous studies, though differ within and among capsular lineages. We improve phylogenetic resolution of Siphocampylus, which forms ten groups of closely related species which we informally name. Two subclades of Siphocampylus and two individual species are rogue taxa whose placement differs widely across analyses. Gene tree discordance (including cytonuclear discordance) is rampant. Conclusions- The first phylogenomic study of the centropogonid clade considerably improves our understanding of relationships in this rapid radiation. Differences across analyses and the possibility of additional lineage discoveries still hamper a solid and stable reclassification. Rapid morphological innovation corresponds with a high degree of phylogenomic complexity, including cytonuclear discordance, nuclear gene tree conflict, and well-supported differences between analyses based on different nuclear loci. Taken together, these results point to a potential role of hemiplasy underlying repeated convergent evolution. This hallmark of rapid radiations is likely present in many other species-rich Andean plant radiations.

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mentioning

confidence: 95%

Increased resolution in the face of conflict: phylogenomics of the Neotropical bellflowers (Campanulaceae: Lobelioideae), a rapid plant radiation

Lagomarsino

Frankel

Uribe‐Convers

et al. 2022

Preprint

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“…The tropical Andes are a well known hotspot for biodiversity (Myers et al 2000), however knowledge of their biodiversity seems far from complete, with many new species, and even genera, being described in recent years in different lineages of organisms (e.g. Kaczmarek et al 2014;Michelangeli et al 2014;Shimbori and Shaw 2014;Lagomarsino and Santamaría-Aguilar 2016;Brito et al 2017;Wurdack and Farfan-Rios 2017), including many new Croton species (Murillo 1999;Smith 2006;Riina and Berry 2010;Riina et al 2007Riina et al , 2014Riina et al , 2015. This work represents one more contribution to this increasing list of taxonomic novelties for this genus in the Andes and adjacent areas, and also supports the claim about the importance of herbarium collections in the discovery of plant diversity (Bebber et al 2010).…”

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confidence: 99%

Four New Species of Dragon's Blood Croton (Euphorbiaceae) from South America

et al. 2018

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We describe and illustrate four new species of dragon's blood trees (Croton sect. Cyclostigma) from western South America. Three of the species, Croton beckii from Bolivia and Peru, C. camposii from Peru, and C. santamartensis from Colombia, grow in montane Andean forest, whereas C. tumbesinus occurs in dry forest of the Tumbes/Piura ecoregion of western Ecuador and Peru. The characters that place them in Croton sect. Cyclostigma include the arborescent habit, the presence of reddish to yellowish latex, an indument of stellate trichomes, conspicuous and persistent stipules, acropetiolar/basilaminar nectary glands, and terminal inflorescences with bisexual cymules at the base. These new species give additional support for the Andean region being the main center of diversity of this Neotropical Croton clade, as well as being a region whose biodiversity knowledge is still incomplete.

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Increased resolution in the face of conflict: phylogenomics of the Neotropical bellflowers (Campanulaceae: Lobelioideae), a rapid plant radiation

et al. 2022

View full text Add to dashboard Cite

Background and Aims The centropogonid clade (Lobelioideae: Campanulaceae) is an Andean-centered rapid radiation characterized by repeated convergent evolution of morphological traits, including fruit type and pollination syndromes. While previous studies have resolved relationships of lineages with fleshy fruits into subclades, relationships among capsular species remain unresolved. This lack of resolution has impeded reclassification of non-monophyletic genera, whose current taxonomy relies heavily on traits that have undergone convergent evolution. Methods Targeted sequence capture using a probeset recently developed for the centropogonid clade was used to obtain phylogenomic data from DNA extracted from both silica-dried and herbarium leaf tissue. These data were used to infer relationships among species using concatenated and partitioned species tree methods, and to quantify gene tree discordance. Key Results While silica-dried leaf tissue resulted in longer assembled sequence data, the inclusion of herbarium samples improved taxonomic representation. Relationships among baccate lineages are similar to those inferred in previous studies, although they differ for lineages within and among capsular clades. We improve phylogenetic resolution of Siphocampylus, which forms ten groups of closely related species which we informally name. Two subclades of Siphocampylus and two individual species are rogue taxa whose placement differs widely across analyses. Gene tree discordance (including cytonuclear discordance) is rampant. Conclusions The first phylogenomic study of the centropogonid clade considerably improves our understanding of relationships in this rapid radiation. Differences across analyses and the possibility of additional lineage discoveries still hamper a solid and stable reclassification. Rapid morphological innovation corresponds with a high degree of phylogenomic complexity, including cytonuclear discordance, nuclear gene tree conflict, and well-supported differences between analyses based on different nuclear loci. Taken together, these results point to a potential role of hemiplasy underlying repeated convergent evolution. This hallmark of rapid radiations is likely present in many other species-rich Andean plant radiations.

show abstract

Two new species of Siphocampylus (Campanulaceae, Lobelioideae) from the Central Andes

Cited by 3 publications

References 12 publications

Increased resolution in the face of conflict: phylogenomics of the Neotropical bellflowers (Campanulaceae: Lobelioideae), a rapid plant radiation

Increased resolution in the face of conflict: phylogenomics of the Neotropical bellflowers (Campanulaceae: Lobelioideae), a rapid plant radiation

Four New Species of Dragon's Blood Croton (Euphorbiaceae) from South America

Increased resolution in the face of conflict: phylogenomics of the Neotropical bellflowers (Campanulaceae: Lobelioideae), a rapid plant radiation

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