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. 2017 Mar 7;15:15. doi: 10.1186/s12915-017-0356-8

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© Couvreur et al. 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 4 — Temporal distribution of collecting efforts. a Number of herbarium records for tropical Africa per 5-year slices from 1782 to 2015. b Temporal evolution of the average number of specimens per SU for all species. Plots based on georeferenced herbarium records only