Population structure in A. artemisiifolia.

A: Map showing locations of the populations. Map tiles by Stamen Design, under CC BY 3.0. B: Genetic variation along the first two axes of a principal components analysis (PCA). Variation explained by the PCs is shown in brackets. C: The increase of genetic distance (FST) as a function of geographical distance between the populations. D: Estimated admixture proportions for three different numbers of ancestral populations (K).