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. 2016 Mar 30;16:18. doi: 10.1186/s12898-016-0072-1

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© Bartlewicz et al. 2016

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. 7 — Map showing the locations of the 20 Linaria vulgaris populations studied in the vicinity of Leuven, Belgium. These populations have been color coded to represent the degree of impervious surfaces within 500 m radius of each population. From these populations, five shoots were chosen at random, and a single inflorescence was taken from each plant. Nectar was collected from four flowers belonging to each inflorescence