Topic
Boraginales
About: Boraginales is a research topic. Over the lifetime, 84 publications have been published within this topic receiving 1656 citations.
Papers published on a yearly basis
Papers
TL;DR: A general secondary structure of ITS1 for Boraginales, with four major helices, is proposed here and it is demonstrated that in each subtaxon, derivations from this structure are found.
Abstract: In this study, we present the possibilities for calculating systematic relationships on higher taxonomical levels based exclusively on ITS1. This is demonstrated for Boraginales (Boraginaceae s.str., Cordiaceae, Ehretiaceae, Heliotropiaceae, Hydrophyllaceae and Lennoaceae). Secondary structure of the ITS1 region is more conserved than the primary structure (i.e., sequence itself) and is therefore a tool for optimizing alignments. It increases the number of structural characters. Information inferred from the secondary structure enables us to construct well-resolved phylogenetic trees at higher taxonomic levels. A general secondary structure of ITS1 for Boraginales, with four major helices, is proposed here. In each subtaxon, derivations from this structure are found. The paraphyly of Boraginaceae s.l. is evident from both a comparison of secondary structures and from bootstrap analysis. Boraginaceae s.str. are the sister group of a clade formed by Hydrophyllaceae, Cordiaceae, Ehretiaceae, Heliotropiaceae and Lennoaceae. The last four taxa constitute a monophyletic group which is the sister group of Hydrophyllaceae. Lennoaceae are closely related to Ehretiaceae, and these two taxa in turn are the sister group of Cordiaceae.
149 citations
University of Chile1, University of Bonn2, University of Florence3, Ludwig Maximilian University of Munich4, Santa Barbara Botanic Garden5, Rancho Santa Ana Botanic Garden6, Free University of Berlin7, Missouri Botanical Garden8, Ruhr University Bochum9, University of Siena10, University of Kiel11, University of Washington12, San Diego State University13, University of Seville14, University of California, Berkeley15
TL;DR: A consensus classification is proposed here, based on recent molecular phylogenetic studies, morphological characters, and taking nomenclatural stability into consideration, of eleven, morphologically well-defined and clearly monophyletic families, namely the Boraginaceae and Coldeniaceae.
Abstract: The Boraginales are now universally accepted as monophyletic and firmly placed in Lamiidae. However, a consensus about familial classification has remained elusive, with some advocating recognition of a single, widely variable family, and others proposing recognition of several distinct families. A consensus classification is proposed here, based on recent molecular phylogenetic studies, morphological characters, and taking nomenclatural stability into consideration. We suggest the recognition of eleven, morphologically well-defined and clearly monophyletic families, namely the Boraginaceae s.str., Codonaceae, Coldeniaceae fam. nov., Cordiaceae, Ehretiaceae, Heliotropiaceae, Hoplestigmataceae, Hydrophyllaceae, Lennoaceae, Namaceae, and Wellstediaceae. Descriptions, synonomy, a taxonomic key, and a list of genera for these eleven families are provided, including the new family Coldeniaceae (monogeneric) and Namaceae (segregated from Hydrophyllaceae and comprising Nama, Eriodictyon, Turricula, and Wigandia), the latter necessitating a revised circumscription of a more morphologically coherent Hydrophyllaceae.
128 citations
121 citations
TL;DR: The dating analysis suggests that the stem lineage of Tiquilia split from its nearest extant relative in the Paleocene or Eocene, followed by a relatively long period before the first divergence in the crown group near the Eocene/Oligocene boundary, shortly after the greatest Cenozoic episode of rapid aridification.
113 citations
TL;DR: An analysis of evolutionary relationships within the angiosperm family Hydrophyllaceae was completed and a parsimony search using DNA sequence data from the chloroplast gene ndhF from 65 accessions yielded 3,227 most parsimonious trees distributed over six tree islands.
Abstract: An analysis of evolutionary relationships within the angiosperm family Hydrophyllaceae was completed. A parsimony search using DNA sequence data from the chloroplast gene ndhF from 65 accessions yielded 3,227 most parsimonious trees distributed over six tree islands. Hydrophyllaceae, excluding Hydrolea and Codon, are nested within a paraphyletic Boraginaceae sensu lato. These "core" Hydrophyllaceae are restricted to the New World and have the derived feature of capsular fruits with parietal placentation and many small seeds. Two large clades can be recognized-a clade of annual and perennial herbs including Phacelia, tribe Hydrophylleae, and related genera, and a clade containing Nama and the woody, shrubby gen- era Eriodictyon, Turricula, and Wigandia. The second clade corresponds to the tribe Nameae sensu Gray, but the first has not been formally recognized. Evolutionary relationships based on ndhF are compared to current clas- sification systems and inferences about evolution based on published morphological and anatomical studies.
88 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 5 |
| 2020 | 4 |
| 2019 | 6 |
| 2018 | 7 |
| 2017 | 5 |
| 2016 | 9 |