Show simple item record Whitten, W. Mark Jacono, Colette C. Nagalingum, Nathalie S. 2012-10-12T20:16:38Z 2012-10-12T20:16:38Z 2012-04
dc.identifier doi:10.5061/dryad.pk93r
dc.identifier.citation Whitten WM, Jacono CC, Nagalingum NS (2012) An expanded plastid phylogeny of Marsilea with emphasis on North American species. American Fern Journal 102(2): 114-135.
dc.description Ferns of the genus Marsilea (water clover) are potentially invasive aquatic and wetland plants. They are difficult to identify to species because of subtle diagnostic characters, the sterile condition of many specimens, and unresolved taxonomic problems. We sequenced four plastid regions (rbcL, rps4, rps4-trnS spacer, and trnL-F spacer) from 223 accessions across ca. 38 species. Our goals were to: 1) attempt to identify problematic Marsilea specimens from the southeastern U.S., and 2) assess species delimitation using molecular data. Florida specimens previously identified as M. aff. oligospora do not match true M. oligospora (native to the western USA), and might represent an undescribed native species. The molecular data fail to resolve many species as monophyletic within the New World Marsilea section Nodorhizae. The data reveal two strongly supported clades within section Nodorhizae: 1) A western U.S. /Mexican clade; and 2) A U.S. Gulf coastal plain/Florida/Caribbean clade. This DNA/morphology discordance suggests that these taxa either may have hybridized extensively or that the number of Marsilea species within these clades may be overestimated. Either case warrants the addition of nuclear data sets and reevaluation of the species boundaries within the genus.
dc.relation.ispartofseries 102;2;2012
dc.relation.haspart doi:10.5061/dryad.pk93r/1
dc.relation.isreferencedby doi:10.1640/0002-8444-102.2.114
dc.subject phylogenetics
dc.subject plastid
dc.subject species delimitations
dc.title Data from: An expanded plastid phylogeny of Marsilea with emphasis on North American species
dc.type Article *
dwc.ScientificName Marsilea
dc.contributor.correspondingAuthor Whitten, W. Mark
prism.publicationName American Fern Journal

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