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The placement of Boraginales, and relationships within the family have remained elusive in modern, broad phylogenetic studies. In order to assess the phylogeny of Boraginales, and specifically to test the sister lineage of the order, a data matrix of the chloroplast markers rbcL, ndhF, and trnL-trnF was assembled from GenBank and de novo sequences (representing 132 new GenBank accessions). Phylogenies inferred using Maximum Likelihood and Bayesian frameworks resulted in identical topologies. Tests for alternative topologies were used to assess whether any of the candidates for sister (Solanales, Gentianales, Lamiales, or Vahlia) to Boraginales could be ruled out with this dataset. Gentianales was eliminated as the possible closest relative to Boraginales. Additionally, Shimodaira-Hasegawa tests were used to test topological results within Boraginales: monophyly of Hydrophyllaceae cannot be rejected and paraphyly of Ehretiaceae with respect to the parasitic Lennoaceae is supported. Taxonomic implications are discussed within the context of these phylogenetic results.

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© 2017 Kristen Hasenstab

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This work is licensed under a Creative Commons Attribution 4.0 License.

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