Figure 1
From: Admixture mapping of quantitative traits in Populus hybrid zones: power and limitations

Boxplots showing untransformed phenotypic measurements for P. tremula (gray) and P. alba (white) at all four localities (Spa, Spain; Ita, Italy; Aus, Austria; Hun, Hungary). Indicated are P-values of Kruskal–Wallis rank-sum tests for the null hypothesis that within a species, all four localities have the same median. Four representative traits are shown. For additional traits see Supplementary Figure S2.