**Acknowledgements**

We are grateful with Daniel G. Debouck and the Genetic Resources Unit at the International Center for Tropical Agriculture for donating the seeds and sharing the geographic coordinates of the plant material that was referred to in this study. This research was supported by the Lundell and Tullberg grants to AJC. The Geneco mobility fund from Lund University is acknowledged for making possible the synergistic meeting between AJC and MWB in the Spring of 2015 at Nashville, Tennessee. Writing time was possible thanks to the grants CTS14:55 from the Carl Trygger Foundation to S. Berlin and 4.1-2016-00418 from Vetenskapsrådet (VR) to AJC.
