Map of populations sampled in the native range.

<p>Sampled populations and distribution of chloroplast DNA haplotypes of <i>Elodea canadensis</i> (circles) and <i>E. nuttallii</i> (triangles) in the United States of America and Canada. Site numbers correspond to those in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0058073#pone-0058073-t001" target="_blank">Table 1</a>, and shapes, shades and patterns correspond to the haplotypes in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0058073#pone-0058073-g003" target="_blank">Figure 3</a>.