Rolfsmeier, Susan , Ferguson, Carolyn .
Phylogeny and taxonomy of North American Lappula (Boraginaceae) in the context of Eurasian diversity.
The genus Lappula (Boraginaceae) includes approximately 67 species of annual and biennial herbs. Diversity is concentrated in Asiatic Russia and Central Asia. In the late nineteenth and early twentieth century, over twenty species were described from western North America. These have, at various times, been treated as synonymous with (or as varieties of) particular Eurasian species. The North American specimens with a single row of spines have variously been referred to the Eurasian L. redowskii (Hornem.) Greene, and those with multiple rows of spines to the Eurasian L. squarrosa (Retz.) Dumort (which has been introduced and naturalized in North America). DNA sequence data from the internal transcribed spacer (ITS) region of the nuclear ribosomal DNA suggest that the native North American taxa represent a monophyletic group, distinct from the Eurasian taxa; preliminary data from chloroplast intergenic spacers also support this finding. Lappula redowskii is sister to the North American clade, while L. squarrosa (including samples from Siberia and from naturalized populations in North America) is more distantly related. An overview of phylogenetic findings is presented, along with discussion of taxonomic implications.
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1 - Kansas State University, Division Of Biology, Ackert 115, Manhattan, KS, 66506, USA
2 - Kansas State University, Division of Biology, Ackert Hall, Manhattan, KS, 66506, USA
North America .
Presentation Type: Poster:Posters for Sections
Location: Khorassan Ballroom/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 5:30 PM