Journal
SYSTEMATIC BOTANY
Volume 37, Issue 3, Pages 758-783Publisher
AMER SOC PLANT TAXONOMISTS
DOI: 10.1600/036364412X648715
Keywords
Asteridae; Boraginaceae; Boraginoideae; maximum likelihood; Mertensia; molecular phylogenetics
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Funding
- NSF DDIG [DEB-1110484]
- NSF East Asia and Pacific Summer Institute Fellowship, China
- Betty W. Higinbotham Trust in Botany
- Noe Higinbotham Award in Botany
- Gertrude Hardman Native Plant Award through Washington State University
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The phylogenetic relationships of Mertensia (Boraginaceae), which comprises approximately 45 species in both Asia and North America, have been uncertain, and taxonomists have placed the genus in various tribes of subfamily Boraginoideae, with the most recent placements in Trigonotideae and Cynoglosseae. Our study applies molecular phylogenetic methods to test the monophyly and relationships of Mertensia. We used DNA sequence data from the nuclear ribosomal nrITS region and four cpDNA regions (matK, ndhF, rbcL, trnL-trnF) to examine the placement of Mertensin among a sampling of accessions from approximately 70% of the genera of Boraginaceae s. I. Phylogeny reconstructions using maximum parsimony, maximum likelihood, and Bayesian inference were largely congruent with previous molecular phylogenetic analyses of Boraginaceae that had applied far fewer taxa. We recovered five deep clades that correspond to Boraginaceae subfamilies Boraginoideae, Cordioideae, Heliotropioideae, Hydrophylloideae, and Ehretioideae (including Lennoa and Pholisma). In sub-family Boraginoideae, we recovered clades that correspond to the tribes Echiochilieae, Lithospermeae, Cynoglosseae, and Boragineae, although several tribes previously circumscribed on the basis of morphological data were not recovered as monophyletic in our results. Based on the sister relationship between the genus Codon and subfamily Boraginoideae found in our phylogeny reconstructions, we propose Codoneae as a new tribe of Boraginoideae. We recovered strong support for the monophyly of Mertensin and the placement of the monotypic genus Asperugo as its sister. Mertensin and Asperugo were strongly supported as members of Cynoglosseae.
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