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. 2017 Jan 6;5(1):apps.1600108. doi: 10.3732/apps.1600108

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© 2017 Rudin et al. Published by the Botanical Society of America

This is an open access article distributed under the terms of the Creative Commons Attribution License (CC-BY-NC-SA 4.0), which permits unrestricted noncommercial use and redistribution provided that the original author and source are credited and the new work is distributed under the same license as the original.

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Fig. 4. — Concentration (μg/g) of Cu (A), Pb, (B), and Zn (C) of Plantago specimens from the historical and 2015 time periods. Samples from all sites were pooled for each time period (n = 4 for each site at each time period). Marginally significant differences in Pb concentrations are indicated by P values based on Wilcoxon (p1) and Kruskal–Wallis rank sums tests (p2).