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Boechera or not? Phylogeny and phylogeography of eastern North American Boechera species (Brassicaceae)

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The North American genus Boechera comprises according to current taxonomic classification 110 species. Most of them are centered in western North America, with some species extending from the west into eastern North America and seven exclusively occurring in eastern North America. Past phylogenetic studies placed some eastern species as sister to western North American Boechera. Our analysis of cpDNA markers (trnL intron, trnLF IGS) and nrDNA ITS1 and ITS2 shows that eastern North American Boechera represent two evolutionary lineages within Boechera (cpDNA) or tribe Boechereae (nrDNA). Based on our data we suggest retaining the eastern North American species within Boechera rather than transferring them into a new genus. A possible migration scenario of Boechera into eastern North America is given. The Siberian Boechera falcata, the Siberian genus Borodinia, and the genus Nevada are shown to be members of a broader defined genus Boechera.
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Document Type: Research Article

Affiliations: Heidelberg Institute of Plant Science, Department of Biodiversity and Plant Systematics, Im Neuenheimer Feld 345, 69120 Heidelberg, Germany

Publication date: 2009-11-01

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