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. 2016 Nov 8;16:238. doi: 10.1186/s12862-016-0812-z

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© The Author(s). 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. 4 — Beast chronogram of the African yam lineages dated using three calibrations points (● Dioscoreaceae: 80 mya [42], ★Dioscorea Stenophora clade crown node 48.2 mya [43] and Dioscorea dregeana - D. dumetorum clade node in Counpound Leaved clade 27.2 mya [44]). Only the four major clades are displayed in the figure. For subclade information, refer to Fig. 3

Inline graphic — Beast chronogram of the African yam lineages dated using three calibrations points (● Dioscoreaceae: 80 mya [42], ★Dioscorea Stenophora clade crown node 48.2 mya [43] and Dioscorea dregeana - D. dumetorum clade node in Counpound Leaved clade 27.2 mya [44]). Only the four major clades are displayed in the figure. For subclade information, refer to Fig. 3