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. 2017 Aug 29;7:9872. doi: 10.1038/s41598-017-09834-6

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Maximum clade credibility (MCC) tree from the BEAST analysis of plastid and nuclear markers with ancestrsal areas reconstructed using (DEC). Areas are: blue) Namib-Karoo plus the Cape (1 + 2); green) Natal-Drakensberg (3); yellow) Eastern Africa (4); red) Sahara, Arabia and W Asia (5); orange) America; purple) Eurasia. Maps on the right indicate the number of endemic species ascribed to each clade by grid cell of 2° of latitude × 2° longitude. The map with the vegetation zones is a simplification of the map in Fig. 1 generated with the software Adobe Illustrator CS4 (https://www.adobe.com). The maps on the right of the figure were also generated with the software Adobe Illustrator CS4 (https://www.adobe.com).