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Nuclear and plastid haplotypes suggest rapid diploid and polyploid speciation in the N Hemisphere Achillea millefolium complex (Asteraceae)

Yan-Ping Guo*, Shuai-Zhen Wang, Claus Vogl and Friedrich Ehrendorfer

BMC Evolutionary Biology 2012, 12:2  doi:10.1186/1471-2148-12-2