Principal components analysis (PCA) of 1030 <i>Vitis</i> samples using 3231 SNPs.

<p>The proportion of the variance explained is found within parentheses on each axis. <b>A) PCA with all samples included.</b> PC1 clearly separates <i>vinifera</i> and <i>sylvestris</i> from the other wild <i>Vitis</i> species while PC2 separates <i>rotundifolia</i> from all others. <b>B–D) PCA with </b><b><i>rotundifolia</i></b><b>, </b><b><i>sylvestris</i></b><b> and </b><b><i>vinifera</i></b><b> removed.</b> Examining the distances between individual samples in PC space confirms that the curated sample set used in the present study does not likely suffer from mislabeling or curation error that would lead to false phylogenetic inference.